diff --git a/printing/BUILD.gn b/printing/BUILD.gn
index e71403b9065d73..14a948d31053d6 100644
--- a/printing/BUILD.gn
+++ b/printing/BUILD.gn
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/config/chromeos/ui_mode.gni")
 import("//build/config/features.gni")
 import("//build/config/sysroot.gni")
 import("//build/config/ui.gni")
@@ -14,7 +15,7 @@ if (is_mac) {
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
-if (use_cups && is_chromeos) {
+if (use_cups && is_chromeos_ash) {
   import("//printing/backend/tools/code_generator.gni")
 }
 
@@ -28,7 +29,7 @@ if ((enable_basic_printing && is_win) || enable_print_preview) {
 # Enable the CUPS IPP printing backend.
 # TODO(crbug.com/226176): Remove this after CUPS PPD API calls are removed.
 declare_args() {
-  use_cups_ipp = use_cups && !is_linux
+  use_cups_ipp = use_cups && !(is_linux || is_chromeos_lacros)
 }
 
 # Several targets want to include this header file. We separate it out
@@ -37,7 +38,7 @@ source_set("printing_export") {
   sources = [ "printing_export.h" ]
 }
 
-if (use_cups_ipp && is_chromeos) {
+if (use_cups_ipp && is_chromeos_ash) {
   ipp_handler_map_path = "$target_gen_dir/backend/ipp_handler_map.cc"
 
   ipp_code_generate("ipp_handlers_generate") {
@@ -125,7 +126,7 @@ component("printing") {
     ]
   }
 
-  if (is_chromeos) {
+  if (is_chromeos_ash) {
     defines += [ "PRINT_BACKEND_AVAILABLE" ]
 
     sources += [
@@ -136,7 +137,7 @@ component("printing") {
     ]
   }
 
-  if (is_linux) {
+  if (is_linux || is_chromeos_lacros) {
     sources += [
       "printed_document_linux.cc",
       "printing_context_linux.cc",
@@ -239,7 +240,7 @@ component("printing") {
       ]
     }
 
-    if (is_chromeos) {
+    if (is_chromeos_ash) {
       deps += [ ":ipp_handlers_generate" ]
 
       sources += [
@@ -272,7 +273,7 @@ component("printing") {
     }
   }
 
-  if (use_cups_ipp || is_chromeos) {
+  if (use_cups_ipp || is_chromeos_ash) {
     sources += [
       "printer_query_result.h",
       "printer_status.cc",
@@ -381,7 +382,7 @@ test("printing_unittests") {
       sources += [ "backend/cups_ipp_helper_unittest.cc" ]
     }
 
-    if (is_chromeos) {
+    if (is_chromeos_ash) {
       sources += [ "printing_context_chromeos_unittest.cc" ]
     } else {
       sources += [
diff --git a/printing/backend/cups_ipp_constants.cc b/printing/backend/cups_ipp_constants.cc
index 5981f8d6f1d259..1473d483a63d23 100644
--- a/printing/backend/cups_ipp_constants.cc
+++ b/printing/backend/cups_ipp_constants.cc
@@ -24,7 +24,7 @@ constexpr char kIppPinEncryption[] = "job-password-encryption";  // PWG 5100.11
 constexpr char kCollated[] = "separate-documents-collated-copies";
 constexpr char kUncollated[] = "separate-documents-uncollated-copies";
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 
 constexpr char kIppDocumentAttributes[] =
     "document-creation-attributes";                              // PWG 5100.5
@@ -35,6 +35,6 @@ constexpr char kPinEncryptionNone[] = "none";
 constexpr char kOptionFalse[] = "false";
 constexpr char kOptionTrue[] = "true";
 
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 }  // namespace printing
diff --git a/printing/backend/cups_ipp_constants.h b/printing/backend/cups_ipp_constants.h
index 83fa9a25f927ca..38d1c46a8c8085 100644
--- a/printing/backend/cups_ipp_constants.h
+++ b/printing/backend/cups_ipp_constants.h
@@ -25,7 +25,7 @@ PRINTING_EXPORT extern const char kIppPinEncryption[];
 PRINTING_EXPORT extern const char kCollated[];
 PRINTING_EXPORT extern const char kUncollated[];
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 
 PRINTING_EXPORT extern const char kIppDocumentAttributes[];
 PRINTING_EXPORT extern const char kIppJobAttributes[];
@@ -35,7 +35,7 @@ PRINTING_EXPORT extern const char kPinEncryptionNone[];
 PRINTING_EXPORT extern const char kOptionFalse[];
 PRINTING_EXPORT extern const char kOptionTrue[];
 
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 }  // namespace printing
 
diff --git a/printing/backend/cups_ipp_helper.cc b/printing/backend/cups_ipp_helper.cc
index 4e86ba71cd6f9d..570a3a900efa1a 100644
--- a/printing/backend/cups_ipp_helper.cc
+++ b/printing/backend/cups_ipp_helper.cc
@@ -24,19 +24,19 @@
 #include "printing/printing_utils.h"
 #include "printing/units.h"
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 #include "base/callback.h"
 #include "base/metrics/histogram_functions.h"
 #include "base/no_destructor.h"
 #include "printing/backend/ipp_handler_map.h"
 #include "printing/printing_features.h"
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 namespace printing {
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 constexpr int kPinMinimumLength = 4;
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 namespace {
 
@@ -256,7 +256,7 @@ bool CollateDefault(const CupsOptionProvider& printer) {
   return name && !base::StringPiece(name).compare(kCollated);
 }
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 bool PinSupported(const CupsOptionProvider& printer) {
   ipp_attribute_t* attr = printer.GetSupportedOptionValues(kIppPin);
   if (!attr)
@@ -311,7 +311,7 @@ void ExtractAdvancedCapabilities(const CupsOptionProvider& printer,
   attr_count += AddAttributes(printer, kIppDocumentAttributes, options);
   base::UmaHistogramCounts1000("Printing.CUPS.IppAttributesCount", attr_count);
 }
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 }  // namespace
 
@@ -334,11 +334,11 @@ void CapsAndDefaultsFromPrinter(const CupsOptionProvider& printer,
   printer_info->default_paper = DefaultPaper(printer);
   printer_info->papers = SupportedPapers(printer);
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   printer_info->pin_supported = PinSupported(printer);
   if (base::FeatureList::IsEnabled(printing::features::kAdvancedPpdAttributes))
     ExtractAdvancedCapabilities(printer, printer_info);
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
   ExtractCopies(printer, printer_info);
   ExtractColor(printer, printer_info);
diff --git a/printing/backend/cups_ipp_helper_unittest.cc b/printing/backend/cups_ipp_helper_unittest.cc
index 0713dc5e92df38..5bb5c7ec964596 100644
--- a/printing/backend/cups_ipp_helper_unittest.cc
+++ b/printing/backend/cups_ipp_helper_unittest.cc
@@ -285,7 +285,7 @@ TEST_F(PrintBackendCupsIppHelperTest, OmitPapersWithSpecialVendorIds) {
                          "iso b0")));
 }
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 TEST_F(PrintBackendCupsIppHelperTest, PinSupported) {
   printer_->SetSupportedOptions("job-password", MakeInteger(ipp_, 4));
   printer_->SetSupportedOptions("job-password-encryption",
@@ -364,6 +364,6 @@ TEST_F(PrintBackendCupsIppHelperTest, AdvancedCaps) {
   EXPECT_EQ(3u, caps.advanced_capabilities[5].values.size());
   histograms.ExpectUniqueSample("Printing.CUPS.IppAttributesCount", 5, 1);
 }
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 }  // namespace printing
diff --git a/printing/backend/mojom/BUILD.gn b/printing/backend/mojom/BUILD.gn
index 3433bc1ad039e0..5a4fdc6abfd697 100644
--- a/printing/backend/mojom/BUILD.gn
+++ b/printing/backend/mojom/BUILD.gn
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/config/chromeos/ui_mode.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 mojom("mojom") {
@@ -30,11 +31,14 @@ mojom("mojom") {
       ]
       traits_sources = [ "print_backend_mojom_traits.cc" ]
       traits_headers = [ "print_backend_mojom_traits.h" ]
-      traits_deps = [ "//printing:printing" ]
+      traits_deps = [
+        "//build:chromeos_buildflags",
+        "//printing:printing",
+      ]
     },
   ]
 
-  if (is_chromeos) {
+  if (is_chromeos_ash) {
     cpp_typemaps += [
       {
         types = [
diff --git a/printing/backend/mojom/print_backend_mojom_traits.cc b/printing/backend/mojom/print_backend_mojom_traits.cc
index 473be1bd34a65d..ca7a99e5182d0f 100644
--- a/printing/backend/mojom/print_backend_mojom_traits.cc
+++ b/printing/backend/mojom/print_backend_mojom_traits.cc
@@ -7,6 +7,7 @@
 #include <map>
 
 #include "base/logging.h"
+#include "build/chromeos_buildflags.h"
 #include "ui/gfx/geometry/mojom/geometry.mojom-shared.h"
 #include "ui/gfx/geometry/mojom/geometry_mojom_traits.h"
 
@@ -38,7 +39,7 @@ struct less<::printing::PrinterSemanticCapsAndDefaults::Paper> {
   }
 };
 
-#if defined(OS_CHROMEOS)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 template <>
 struct less<::printing::AdvancedCapability> {
   bool operator()(const ::printing::AdvancedCapability& lhs,
@@ -48,7 +49,7 @@ struct less<::printing::AdvancedCapability> {
     return lhs.display_name < rhs.display_name;
   }
 };
-#endif  // defined(OS_CHROMEOS)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 }  // namespace std
 
@@ -114,7 +115,7 @@ bool StructTraits<printing::mojom::PaperDataView,
          data.ReadVendorId(&out->vendor_id) && data.ReadSizeUm(&out->size_um);
 }
 
-#if defined(OS_CHROMEOS)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 // static
 printing::mojom::AdvancedCapabilityType
 EnumTraits<printing::mojom::AdvancedCapabilityType,
@@ -176,7 +177,7 @@ bool StructTraits<printing::mojom::AdvancedCapabilityDataView,
          data.ReadDefaultValue(&out->default_value) &&
          data.ReadValues(&out->values);
 }
-#endif  // defined(OS_CHROMEOS)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 // static
 bool StructTraits<printing::mojom::PrinterSemanticCapsAndDefaultsDataView,
@@ -200,11 +201,11 @@ bool StructTraits<printing::mojom::PrinterSemanticCapsAndDefaultsDataView,
     return false;
   }
 
-#if defined(OS_CHROMEOS)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   out->pin_supported = data.pin_supported();
   if (!data.ReadAdvancedCapabilities(&out->advanced_capabilities))
     return false;
-#endif  // defined(OS_CHROMEOS)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
   // Extra validity checks.
 
@@ -247,7 +248,7 @@ bool StructTraits<printing::mojom::PrinterSemanticCapsAndDefaultsDataView,
     return false;
   }
 
-#if defined(OS_CHROMEOS)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   DuplicateChecker<printing::AdvancedCapability>
       advanced_capabilities_dup_checker;
   if (advanced_capabilities_dup_checker.HasDuplicates(
@@ -255,7 +256,7 @@ bool StructTraits<printing::mojom::PrinterSemanticCapsAndDefaultsDataView,
     DLOG(ERROR) << "Duplicate advanced_capabilities detected.";
     return false;
   }
-#endif  // defined(OS_CHROMEOS)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
   return true;
 }
diff --git a/printing/backend/mojom/print_backend_mojom_traits.h b/printing/backend/mojom/print_backend_mojom_traits.h
index aea6a89cbd5036..13b3249f0ab2f6 100644
--- a/printing/backend/mojom/print_backend_mojom_traits.h
+++ b/printing/backend/mojom/print_backend_mojom_traits.h
@@ -8,6 +8,7 @@
 #include <string>
 #include <vector>
 
+#include "build/chromeos_buildflags.h"
 #include "printing/backend/mojom/print_backend.mojom-shared.h"
 #include "printing/backend/print_backend.h"
 #include "printing/mojom/print.mojom.h"
@@ -63,7 +64,7 @@ struct StructTraits<printing::mojom::PaperDataView,
                    printing::PrinterSemanticCapsAndDefaults::Paper* out);
 };
 
-#if defined(OS_CHROMEOS)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 template <>
 struct EnumTraits<printing::mojom::AdvancedCapabilityType,
                   ::printing::AdvancedCapability::Type> {
@@ -114,7 +115,7 @@ struct StructTraits<printing::mojom::AdvancedCapabilityDataView,
   static bool Read(printing::mojom::AdvancedCapabilityDataView data,
                    ::printing::AdvancedCapability* out);
 };
-#endif  // defined(OS_CHROMEOS)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 template <>
 struct StructTraits<printing::mojom::PrinterSemanticCapsAndDefaultsDataView,
@@ -174,7 +175,7 @@ struct StructTraits<printing::mojom::PrinterSemanticCapsAndDefaultsDataView,
     return p.default_dpi;
   }
 
-#if defined(OS_CHROMEOS)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   static bool pin_supported(const printing::PrinterSemanticCapsAndDefaults& p) {
     return p.pin_supported;
   }
@@ -182,7 +183,7 @@ struct StructTraits<printing::mojom::PrinterSemanticCapsAndDefaultsDataView,
       const printing::PrinterSemanticCapsAndDefaults& p) {
     return p.advanced_capabilities;
   }
-#endif  // defined(OS_CHROMEOS)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
   static bool Read(printing::mojom::PrinterSemanticCapsAndDefaultsDataView data,
                    printing::PrinterSemanticCapsAndDefaults* out);
diff --git a/printing/backend/mojom/print_backend_mojom_traits_unittest.cc b/printing/backend/mojom/print_backend_mojom_traits_unittest.cc
index b0360c34520f49..1457d63651645f 100644
--- a/printing/backend/mojom/print_backend_mojom_traits_unittest.cc
+++ b/printing/backend/mojom/print_backend_mojom_traits_unittest.cc
@@ -6,6 +6,7 @@
 #include <string>
 #include <vector>
 
+#include "build/chromeos_buildflags.h"
 #include "mojo/public/cpp/test_support/test_utils.h"
 #include "printing/backend/mojom/print_backend.mojom.h"
 #include "printing/backend/print_backend.h"
@@ -29,7 +30,7 @@ const printing::PrinterSemanticCapsAndDefaults::Paper kPaperLedger{
     /*display_name=*/"Ledger", /*vendor_id=*/"89",
     /*size_um=*/gfx::Size(6600, 10200)};
 
-#if defined(OS_CHROMEOS)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 const printing::AdvancedCapability kAdvancedCapability1(
     /*name=*/"advanced_cap_bool",
     /*display_name=*/"Advanced Capability #1 (bool)",
@@ -55,7 +56,7 @@ const printing::AdvancedCapability kAdvancedCapability2(
     });
 const printing::AdvancedCapabilities kAdvancedCapabilities{
     kAdvancedCapability1, kAdvancedCapability2};
-#endif  // defined(OS_CHROMEOS)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 static constexpr bool kCollateCapable = true;
 static constexpr bool kCollateDefault = true;
@@ -83,7 +84,7 @@ static constexpr gfx::Size kDpi1200(1200, 1200);
 static constexpr gfx::Size kDpi1200x600(1200, 600);
 const std::vector<gfx::Size> kDpis{kDpi600, kDpi1200, kDpi1200x600};
 static constexpr gfx::Size kDefaultDpi = kDpi600;
-#if defined(OS_CHROMEOS)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 static constexpr bool kPinSupported = true;
 #endif
 
@@ -105,10 +106,10 @@ GenerateSamplePrinterSemanticCapsAndDefaults() {
   caps.default_paper = kPaperLetter;
   caps.dpis = kDpis;
   caps.default_dpi = kDefaultDpi;
-#if defined(OS_CHROMEOS)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   caps.pin_supported = kPinSupported;
   caps.advanced_capabilities = kAdvancedCapabilities;
-#endif  // defined(OS_CHROMEOS)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
   return caps;
 }
@@ -189,7 +190,7 @@ TEST(PrintBackendMojomTraitsTest, TestSerializeAndDeserializePaper) {
   }
 }
 
-#if defined(OS_CHROMEOS)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 TEST(PrintBackendMojomTraitsTest,
      TestSerializeAndDeserializeAdvancedCapability) {
   for (const auto& advanced_capability : kAdvancedCapabilities) {
@@ -200,7 +201,7 @@ TEST(PrintBackendMojomTraitsTest,
     EXPECT_EQ(advanced_capability, output);
   }
 }
-#endif  // defined(OS_CHROMEOS)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 TEST(PrintBackendMojomTraitsTest,
      TestSerializeAndDeserializePrinterSemanticCapsAndDefaults) {
@@ -225,10 +226,10 @@ TEST(PrintBackendMojomTraitsTest,
   EXPECT_TRUE(kDefaultPaper == output.default_paper);
   EXPECT_EQ(kDpis, output.dpis);
   EXPECT_EQ(kDefaultDpi, output.default_dpi);
-#if defined(OS_CHROMEOS)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   EXPECT_EQ(kPinSupported, output.pin_supported);
   EXPECT_EQ(kAdvancedCapabilities, output.advanced_capabilities);
-#endif  // defined(OS_CHROMEOS)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 }
 
 TEST(PrintBackendMojomTraitsTest,
@@ -257,14 +258,14 @@ TEST(
   const printing::PrinterSemanticCapsAndDefaults::Papers
       kEmptyUserDefinedPapers{};
   const std::vector<gfx::Size> kEmptyDpis{};
-#if defined(OS_CHROMEOS)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   const printing::AdvancedCapabilities kEmptyAdvancedCapabilities{};
 #endif
 
   input.duplex_modes = kEmptyDuplexModes;
   input.user_defined_papers = kEmptyUserDefinedPapers;
   input.dpis = kEmptyDpis;
-#if defined(OS_CHROMEOS)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   input.advanced_capabilities = kEmptyAdvancedCapabilities;
 #endif
 
@@ -274,7 +275,7 @@ TEST(
   EXPECT_EQ(kEmptyDuplexModes, output.duplex_modes);
   EXPECT_EQ(kEmptyUserDefinedPapers, output.user_defined_papers);
   EXPECT_EQ(kEmptyDpis, output.dpis);
-#if defined(OS_CHROMEOS)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   EXPECT_EQ(kEmptyAdvancedCapabilities, output.advanced_capabilities);
 #endif
 }
@@ -331,7 +332,7 @@ TEST(
   EXPECT_FALSE(mojo::test::SerializeAndDeserialize<
                printing::mojom::PrinterSemanticCapsAndDefaults>(input, output));
 
-#if defined(OS_CHROMEOS)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   // Use an advanced capability with same name but different other fields.
   printing::AdvancedCapability advancedCapability1Prime = kAdvancedCapability1;
   advancedCapability1Prime.type = printing::AdvancedCapability::Type::kInteger;
diff --git a/printing/backend/print_backend.cc b/printing/backend/print_backend.cc
index 36661ccd7aa77e..9e5820fa387cd5 100644
--- a/printing/backend/print_backend.cc
+++ b/printing/backend/print_backend.cc
@@ -45,7 +45,7 @@ bool PrinterBasicInfo::operator==(const PrinterBasicInfo& other) const {
          is_default == other.is_default && options == other.options;
 }
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 
 AdvancedCapabilityValue::AdvancedCapabilityValue() = default;
 
@@ -89,7 +89,7 @@ bool AdvancedCapability::operator==(const AdvancedCapability& other) const {
          values == other.values;
 }
 
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 bool PrinterSemanticCapsAndDefaults::Paper::operator==(
     const PrinterSemanticCapsAndDefaults::Paper& other) const {
diff --git a/printing/backend/print_backend.h b/printing/backend/print_backend.h
index 4aeb42359d6ea3..e853381d2afc88 100644
--- a/printing/backend/print_backend.h
+++ b/printing/backend/print_backend.h
@@ -20,7 +20,7 @@
 #include "printing/printing_export.h"
 #include "ui/gfx/geometry/size.h"
 
-#if defined(OS_CHROMEOS)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 #include <stdint.h>
 #endif
 
@@ -61,7 +61,7 @@ struct PRINTING_EXPORT PrinterBasicInfo {
 
 using PrinterList = std::vector<PrinterBasicInfo>;
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 
 struct PRINTING_EXPORT AdvancedCapabilityValue {
   AdvancedCapabilityValue();
@@ -111,7 +111,7 @@ struct PRINTING_EXPORT AdvancedCapability {
 
 using AdvancedCapabilities = std::vector<AdvancedCapability>;
 
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 struct PRINTING_EXPORT PrinterSemanticCapsAndDefaults {
   PrinterSemanticCapsAndDefaults();
@@ -149,10 +149,10 @@ struct PRINTING_EXPORT PrinterSemanticCapsAndDefaults {
   std::vector<gfx::Size> dpis;
   gfx::Size default_dpi;
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   bool pin_supported = false;
   AdvancedCapabilities advanced_capabilities;
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 };
 
 struct PRINTING_EXPORT PrinterCapsAndDefaults {
diff --git a/printing/backend/printing_restrictions.cc b/printing/backend/printing_restrictions.cc
index 17a4c949d52e43..b23f89f7eda176 100644
--- a/printing/backend/printing_restrictions.cc
+++ b/printing/backend/printing_restrictions.cc
@@ -8,14 +8,14 @@
 
 namespace printing {
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 const char kAllowedColorModes[] = "allowedColorModes";
 const char kAllowedDuplexModes[] = "allowedDuplexModes";
 const char kAllowedPinModes[] = "allowedPinModes";
 const char kDefaultColorMode[] = "defaultColorMode";
 const char kDefaultDuplexMode[] = "defaultDuplexMode";
 const char kDefaultPinMode[] = "defaultPinMode";
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 const char kPaperSizeName[] = "name";
 const char kPaperSizeNameCustomOption[] = "custom";
diff --git a/printing/backend/printing_restrictions.h b/printing/backend/printing_restrictions.h
index 99d281e245de46..c1c206d341f61a 100644
--- a/printing/backend/printing_restrictions.h
+++ b/printing/backend/printing_restrictions.h
@@ -10,7 +10,7 @@
 
 namespace printing {
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 // Allowed printing modes as a bitmask.
 // This is used in pref file and should never change.
 enum class ColorModeRestriction {
@@ -46,7 +46,7 @@ PRINTING_EXPORT extern const char kAllowedPinModes[];
 PRINTING_EXPORT extern const char kDefaultColorMode[];
 PRINTING_EXPORT extern const char kDefaultDuplexMode[];
 PRINTING_EXPORT extern const char kDefaultPinMode[];
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 // Allowed background graphics modes.
 // This is used in pref file and should never change.
diff --git a/printing/buildflags/buildflags.gni b/printing/buildflags/buildflags.gni
index 86febe492a51fb..058e7f77747eed 100644
--- a/printing/buildflags/buildflags.gni
+++ b/printing/buildflags/buildflags.gni
@@ -4,6 +4,7 @@
 
 import("//build/config/chromecast_build.gni")
 import("//build/config/chromeos/args.gni")
+import("//build/config/chromeos/ui_mode.gni")
 import("//build/config/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
@@ -24,7 +25,7 @@ declare_args() {
     # For fuzzing, just restrict to chromeos and linux.
     use_cups = true
   } else {
-    use_cups = (is_chromeos_device || is_linux || is_mac) && !is_chromecast &&
-               !is_fuchsia
+    use_cups = (is_chromeos_device || (is_linux || is_chromeos_lacros) ||
+                is_mac) && !is_chromecast && !is_fuchsia
   }
 }
diff --git a/printing/print_settings.cc b/printing/print_settings.cc
index 7c43ddeafadc8e..c22c0502d79e7a 100644
--- a/printing/print_settings.cc
+++ b/printing/print_settings.cc
@@ -10,7 +10,7 @@
 #include "build/chromeos_buildflags.h"
 #include "printing/units.h"
 
-#if defined(USE_CUPS) && (defined(OS_MAC) || BUILDFLAG(IS_ASH))
+#if defined(USE_CUPS) && (defined(OS_MAC) || BUILDFLAG(IS_CHROMEOS_ASH))
 #include <cups/cups.h>
 #endif
 
@@ -183,7 +183,7 @@ void GetColorModelForModel(mojom::ColorModel color_model,
   // all ColorModel values are determinantly handled.
 }
 
-#if defined(OS_MAC) || BUILDFLAG(IS_ASH)
+#if defined(OS_MAC) || BUILDFLAG(IS_CHROMEOS_ASH)
 std::string GetIppColorModelForModel(mojom::ColorModel color_model) {
   // Accept |kUnknownColorModel| for consistency with GetColorModelForModel().
   if (color_model == mojom::ColorModel::kUnknownColorModel)
@@ -198,7 +198,7 @@ std::string GetIppColorModelForModel(mojom::ColorModel color_model) {
   return is_color.value() ? CUPS_PRINT_COLOR_MODE_COLOR
                           : CUPS_PRINT_COLOR_MODE_MONOCHROME;
 }
-#endif  // defined(OS_MAC) || BUILDFLAG(IS_ASH)
+#endif  // defined(OS_MAC) || BUILDFLAG(IS_CHROMEOS_ASH)
 #endif  // defined(USE_CUPS)
 
 base::Optional<bool> IsColorModelSelected(mojom::ColorModel color_model) {
@@ -281,11 +281,11 @@ void PrintSettings::Clear() {
 #if defined(OS_LINUX) || defined(OS_CHROMEOS)
   advanced_settings_.clear();
 #endif  // defined(OS_LINUX) || defined(OS_CHROMEOS)
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   send_user_info_ = false;
   username_.clear();
   pin_value_.clear();
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 }
 
 void PrintSettings::SetPrinterPrintableArea(
diff --git a/printing/print_settings.h b/printing/print_settings.h
index f15f1f84fc7d0d..c3277c631ce1e6 100644
--- a/printing/print_settings.h
+++ b/printing/print_settings.h
@@ -44,7 +44,7 @@ PRINTING_EXPORT void GetColorModelForModel(mojom::ColorModel color_model,
                                            std::string* color_setting_name,
                                            std::string* color_value);
 
-#if defined(OS_MAC) || BUILDFLAG(IS_ASH)
+#if defined(OS_MAC) || BUILDFLAG(IS_CHROMEOS_ASH)
 // Convert from |color_model| to a print-color-mode value from PWG 5100.13.
 PRINTING_EXPORT std::string GetIppColorModelForModel(
     mojom::ColorModel color_model);
@@ -229,7 +229,7 @@ class PRINTING_EXPORT PrintSettings {
   }
 #endif  // defined(OS_LINUX) || defined(OS_CHROMEOS)
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   void set_send_user_info(bool send_user_info) {
     send_user_info_ = send_user_info;
   }
@@ -240,7 +240,7 @@ class PRINTING_EXPORT PrintSettings {
 
   void set_pin_value(const std::string& pin_value) { pin_value_ = pin_value; }
   const std::string& pin_value() const { return pin_value_; }
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
   // Cookie generator. It is used to initialize PrintedDocument with its
   // associated PrintSettings, to be sure that each generated PrintedPage is
@@ -326,7 +326,7 @@ class PRINTING_EXPORT PrintSettings {
   AdvancedSettings advanced_settings_;
 #endif  // defined(OS_LINUX) || defined(OS_CHROMEOS)
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   // Whether to send user info.
   bool send_user_info_;
 
diff --git a/printing/print_settings_conversion.cc b/printing/print_settings_conversion.cc
index 686a2fa1ab4a33..15e52e7b153d49 100644
--- a/printing/print_settings_conversion.cc
+++ b/printing/print_settings_conversion.cc
@@ -211,16 +211,21 @@ std::unique_ptr<PrintSettings> PrintSettingsFromJobSettings(
 #endif
   }
 
-#if defined(OS_CHROMEOS) || (defined(OS_LINUX) && defined(USE_CUPS))
+// TODO(crbug.com/1052397): Revisit once build flag switch of lacros-chrome is
+// complete.
+#if defined(OS_CHROMEOS) ||                                  \
+    ((defined(OS_LINUX) || BUILDFLAG(IS_CHROMEOS_LACROS)) && \
+     defined(USE_CUPS))
   const base::Value* advanced_settings =
       job_settings.FindDictKey(kSettingAdvancedSettings);
   if (advanced_settings) {
     for (const auto& item : advanced_settings->DictItems())
       settings->advanced_settings().emplace(item.first, item.second.Clone());
   }
-#endif  // defined(OS_CHROMEOS) || (defined(OS_LINUX) && defined(USE_CUPS))
+#endif  // defined(OS_CHROMEOS) || ((defined(OS_LINUX) ||
+        // BUILDFLAG(IS_CHROMEOS_LACROS)) && defined(USE_CUPS))
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   bool send_user_info =
       job_settings.FindBoolKey(kSettingSendUserInfo).value_or(false);
   settings->set_send_user_info(send_user_info);
@@ -233,7 +238,7 @@ std::unique_ptr<PrintSettings> PrintSettingsFromJobSettings(
   const std::string* pin_value = job_settings.FindStringKey(kSettingPinValue);
   if (pin_value)
     settings->set_pin_value(*pin_value);
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
   return settings;
 }
diff --git a/printing/print_settings_conversion_unittest.cc b/printing/print_settings_conversion_unittest.cc
index 2f410d2d4621fa..75a0b79453fbc4 100644
--- a/printing/print_settings_conversion_unittest.cc
+++ b/printing/print_settings_conversion_unittest.cc
@@ -61,7 +61,7 @@ TEST(PrintSettingsConversionTest, ConversionTest) {
   std::unique_ptr<PrintSettings> settings =
       PrintSettingsFromJobSettings(value.value());
   ASSERT_TRUE(settings);
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   EXPECT_TRUE(settings->send_user_info());
   EXPECT_EQ("username@domain.net", settings->username());
   EXPECT_EQ("0000", settings->pin_value());
@@ -78,7 +78,7 @@ TEST(PrintSettingsConversionTest, ConversionTest) {
   EXPECT_FALSE(settings);
 }
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 TEST(PrintSettingsConversionTest, ConversionTest_DontSendUsername) {
   base::Optional<base::Value> value = base::JSONReader::Read(kPrinterSettings);
   ASSERT_TRUE(value.has_value());
diff --git a/printing/print_settings_unittest.cc b/printing/print_settings_unittest.cc
index c66d82ea8f7aed..56c0c430a13c7d 100644
--- a/printing/print_settings_unittest.cc
+++ b/printing/print_settings_unittest.cc
@@ -56,7 +56,7 @@ TEST(PrintSettingsTest, GetColorModelForModel) {
   }
 }
 
-#if defined(OS_MAC) || BUILDFLAG(IS_ASH)
+#if defined(OS_MAC) || BUILDFLAG(IS_CHROMEOS_ASH)
 TEST(PrintSettingsTest, GetIppColorModelForModel) {
   for (int model = static_cast<int>(mojom::ColorModel::kUnknownColorModel);
        model <= static_cast<int>(mojom::ColorModel::kColorModelLast); ++model) {
@@ -64,7 +64,7 @@ TEST(PrintSettingsTest, GetIppColorModelForModel) {
                      .empty());
   }
 }
-#endif  // defined(OS_MAC) || BUILDFLAG(IS_ASH)
+#endif  // defined(OS_MAC) || BUILDFLAG(IS_CHROMEOS_ASH)
 #endif  // defined(USE_CUPS)
 
 }  // namespace printing
diff --git a/printing/printed_document_linux.cc b/printing/printed_document_linux.cc
index e3ef9ae649a5a8..c2e2a5d59e1f35 100644
--- a/printing/printed_document_linux.cc
+++ b/printing/printed_document_linux.cc
@@ -8,7 +8,7 @@
 #include "build/chromeos_buildflags.h"
 #include "printing/printing_context_linux.h"
 
-#if defined(OS_ANDROID) || BUILDFLAG(IS_ASH)
+#if defined(OS_ANDROID) || BUILDFLAG(IS_CHROMEOS_ASH)
 #error "This file is not used on Android / ChromeOS ash-chrome"
 #endif
 
diff --git a/printing/printing_context.cc b/printing/printing_context.cc
index 49e0e83868dc8f..92561ff7c6bce6 100644
--- a/printing/printing_context.cc
+++ b/printing/printing_context.cc
@@ -146,7 +146,7 @@ PrintingContext::Result PrintingContext::UpdatePrintSettings(
       job_settings.FindIntKey(kSettingPreviewPageCount).value_or(0));
 }
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 PrintingContext::Result PrintingContext::UpdatePrintSettingsFromPOD(
     std::unique_ptr<PrintSettings> job_settings) {
   ResetSettings();
diff --git a/printing/printing_context.h b/printing/printing_context.h
index 896d1b26f49286..268e03d2b8d4f1 100644
--- a/printing/printing_context.h
+++ b/printing/printing_context.h
@@ -87,7 +87,7 @@ class PRINTING_EXPORT PrintingContext {
   // settings information.
   Result UpdatePrintSettings(base::Value job_settings);
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
   // Updates Print Settings.
   Result UpdatePrintSettingsFromPOD(
       std::unique_ptr<PrintSettings> job_settings);
diff --git a/printing/printing_features.cc b/printing/printing_features.cc
index 7feeeba13f069b..637f7ff47090f4 100644
--- a/printing/printing_features.cc
+++ b/printing/printing_features.cc
@@ -9,11 +9,11 @@
 namespace printing {
 namespace features {
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 // Enables Advanced PPD Attributes.
 const base::Feature kAdvancedPpdAttributes{"AdvancedPpdAttributes",
                                            base::FEATURE_ENABLED_BY_DEFAULT};
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 #if defined(OS_MAC)
 // Use the CUPS IPP printing backend instead of the original CUPS backend that
diff --git a/printing/printing_features.h b/printing/printing_features.h
index 7dda9ddd52c234..35faf4a98b566b 100644
--- a/printing/printing_features.h
+++ b/printing/printing_features.h
@@ -16,9 +16,9 @@ namespace features {
 // The following features are declared alphabetically. The features should be
 // documented with descriptions of their behaviors in the .cc file.
 
-#if BUILDFLAG(IS_ASH)
+#if BUILDFLAG(IS_CHROMEOS_ASH)
 PRINTING_EXPORT extern const base::Feature kAdvancedPpdAttributes;
-#endif  // BUILDFLAG(IS_ASH)
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 #if defined(OS_MAC)
 PRINTING_EXPORT extern const base::Feature kCupsIppPrintingBackend;