Create a skeleton updater main for Windows.

This change builds an executable program on Windows, which returns
a hardcoded value. The value is tested by a unit test.

The updater executable contains a valid resource file and manifest.

An upcoming change will hook the test with the test bots.
Then, another change will implement a similar function for macOS.

Bug: 925489
Change-Id: Id97f4740a2cd9e3d21c00e631a8e03c19757468a
Reviewed-on: https://chromium-review.googlesource.com/c/1437266
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#627053}

BUILD.gn

@@ -67,6 +67,7 @@ group("gn_all") {
     "//base:base_perftests",
     "//base:base_unittests",
     "//chrome/installer",
+    "//chrome/updater",
     "//net:net_unittests",
     "//skia:skia_unittests",
     "//sql:sql_unittests",

chrome/test/BUILD.gn

@@ -4554,6 +4554,11 @@ test("unit_tests") {
   if (enable_widevine && is_win) {
     sources += [ "../gpu/widevine_cdm_proxy_factory_unittest.cc" ]
   }
+
+  # Chrome desktop updater tests.
+  if (is_win || is_mac) {
+    deps += [ "//chrome/updater:updater_tests" ]
+  }
 }
 
 static_library("test_support_unit") {

chrome/updater/BUILD.gn

@@ -0,0 +1,34 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/chrome_build.gni")
+import("//build/config/sanitizers/sanitizers.gni")
+import("//testing/test.gni")
+
+group("updater") {
+  if (is_win) {
+    deps = [
+      "//chrome/updater/win",
+    ]
+  }
+}
+
+source_set("updater_tests") {
+  testonly = true
+  if (is_win) {
+    sources = [
+      "win/updater_unittest.cc",
+    ]
+
+    data_deps = [
+      "//chrome/updater/win:updater",
+    ]
+  }
+
+  deps = [
+    ":updater",
+    "//base/test:test_support",
+    "//testing/gtest",
+  ]
+}

chrome/updater/win/BUILD.gn

@@ -0,0 +1,32 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//chrome/process_version_rc_template.gni")
+
+group("win") {
+  deps = [
+    ":updater",
+  ]
+}
+
+executable("updater") {
+  sources = [
+    "main.cc",
+    "updater.rc",
+  ]
+
+  configs += [ "//build/config/win:windowed" ]
+
+  deps = [
+    ":version_resources",
+    "//build/win:default_exe_manifest",
+  ]
+}
+
+process_version_rc_template("version_resources") {
+  sources = [
+    "updater.ver",
+  ]
+  output = "$target_gen_dir/updater_exe.rc"
+}

chrome/updater/win/main.cc

@@ -0,0 +1,9 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <windows.h>
+
+int APIENTRY wWinMain(HINSTANCE instance, HINSTANCE prev, wchar_t*, int) {
+  return 0;
+}

chrome/updater/win/updater.rc

@@ -0,0 +1,38 @@
+// Microsoft Visual C++ generated resource script.
+//
+
+#define APSTUDIO_READONLY_SYMBOLS
+/////////////////////////////////////////////////////////////////////////////
+//
+// Generated from the TEXTINCLUDE 2 resource.
+//
+#include "winres.h"
+#include "verrsrc.h"
+
+/////////////////////////////////////////////////////////////////////////////
+#undef APSTUDIO_READONLY_SYMBOLS
+
+/////////////////////////////////////////////////////////////////////////////
+// English (United States) resources
+
+#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
+LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
+
+#ifdef APSTUDIO_INVOKED
+/////////////////////////////////////////////////////////////////////////////
+//
+// TEXTINCLUDE
+//
+
+1 TEXTINCLUDE
+BEGIN
+    "#include ""winres.h""\r\n"
+    "#include ""verrsrc.h""\r\n"
+    "\0"
+END
+
+#endif    // APSTUDIO_INVOKED
+
+#endif    // English (United States) resources
+
+/////////////////////////////////////////////////////////////////////////////

chrome/updater/win/updater.ver

@@ -0,0 +1,3 @@
+INTERNAL_NAME=updater_exe
+ORIGINAL_FILENAME=updater.exe
+PRODUCT_FULLNAME=updater

chrome/updater/win/updater_unittest.cc

@@ -0,0 +1,29 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <windows.h>
+
+#include "base/command_line.h"
+#include "base/files/file_path.h"
+#include "base/process/launch.h"
+#include "base/process/process.h"
+#include "base/time/time.h"
+#include "build/build_config.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+// Tests the updater process returns 0 when run with no arguments.
+TEST(UpdaterTest, UpdaterExitCode) {
+  base::FilePath::CharType buffer[MAX_PATH] = {0};
+  ASSERT_NE(0u, GetModuleFileName(0, buffer, base::size(buffer)));
+  const base::FilePath updater =
+      base::FilePath(buffer).DirName().Append(FILE_PATH_LITERAL("updater.exe"));
+  base::LaunchOptions options;
+  options.start_hidden = true;
+  auto process = base::LaunchProcess(base::CommandLine(updater), options);
+  ASSERT_TRUE(process.IsValid());
+  int exit_code = -1;
+  EXPECT_TRUE(process.WaitForExitWithTimeout(base::TimeDelta::FromSeconds(60),
+                                             &exit_code));
+  EXPECT_EQ(0, exit_code);
+}