DNR: Add filter_list_converter tool.

Filter List Converter is a tool to convert filter list files in the text format
to a JSON file in a format supported by the Declarative Net Request API. It can
either output the complete extension (with a manifest file and a JSON ruleset)
or just the JSON ruleset.

This is based on the ruleset converter module in the subresource_filter
component.

BUG=972290

Change-Id: Id67ccaa5cc3cc469da67865c3754b41182d1ab9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1139592
Auto-Submit: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672233}

BUILD.gn

@@ -230,6 +230,7 @@ group("gn_all") {
     deps += [
       "//extensions:extensions_browsertests",
       "//extensions:extensions_unittests",
+      "//extensions/browser/api/declarative_net_request/filter_list_converter",
       "//extensions/shell:app_shell_unittests",
     ]
   }

extensions/browser/BUILD.gn

@@ -686,6 +686,7 @@ source_set("unit_tests") {
     "//device/bluetooth:mocks",
     "//extensions:extensions_browser_resources",
     "//extensions:test_support",
+    "//extensions/browser/api/declarative_net_request/filter_list_converter:unit_tests",
     "//extensions/buildflags",
     "//extensions/common",
     "//extensions/common:test_support",

extensions/browser/api/declarative_net_request/filter_list_converter/BUILD.gn

@@ -0,0 +1,46 @@
+# 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("//extensions/buildflags/buildflags.gni")
+
+assert(enable_extensions)
+
+source_set("support") {
+  testonly = true
+  sources = [
+    "converter.cc",
+    "converter.h",
+  ]
+  deps = [
+    "//base",
+    "//components/subresource_filter/tools/ruleset_converter:support",
+    "//extensions/browser",
+    "//extensions/common",
+    "//extensions/common:test_support",
+    "//url",
+  ]
+}
+
+executable("filter_list_converter") {
+  testonly = true
+  sources = [
+    "main.cc",
+  ]
+  deps = [
+    ":support",
+    "//base",
+  ]
+}
+
+source_set("unit_tests") {
+  testonly = true
+  sources = [
+    "converter_unittest.cc",
+  ]
+  deps = [
+    ":support",
+    "//base",
+    "//testing/gtest",
+  ]
+}

extensions/browser/api/declarative_net_request/filter_list_converter/DEPS

@@ -0,0 +1,3 @@
+include_rules = [
+  "+components/subresource_filter/tools/ruleset_converter",
+]

extensions/browser/api/declarative_net_request/filter_list_converter/README

@@ -0,0 +1,6 @@
+Filter List Converter is a tool to convert filter list files in the text format
+to a JSON file in a format supported by the Declarative Net Request API. It can
+either output the complete extension or just the JSON ruleset.
+
+This is based on the ruleset converter module in the subresource_filter
+component.