Accessibility: Add gn file to build colorenhancer

Initial migration of the old accessibility_extensions.gyp file which
was removed during the gyp purge. Starting with the colorenhancer
extension.

BUG=701521

Review-Url: https://codereview.chromium.org/2763573003
Cr-Commit-Position: refs/heads/master@{#458230}

BUILD.gn

@@ -148,6 +148,7 @@ group("gn_all") {
       "//tools/gn:gn_unittests",
       "//tools/perf/clear_system_cache",
       "//ui/accessibility:accessibility_unittests",
+      "//ui/accessibility/extensions",
     ]
   }
 

ui/accessibility/extensions/BUILD.gn

@@ -0,0 +1,106 @@
+# Copyright 2017 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("//tools/grit/grit_rule.gni")
+
+group("extensions") {
+  deps = [
+    ":colorenhancer",
+  ]
+}
+
+group("colorenhancer") {
+  deps = [
+    ":colorenhancer_copy",
+    ":colorenhancer_strings",
+  ]
+}
+
+locale_files = [
+  "_locales/am/messages.json",
+  "_locales/ar/messages.json",
+  "_locales/bg/messages.json",
+  "_locales/bn/messages.json",
+  "_locales/ca/messages.json",
+  "_locales/cs/messages.json",
+  "_locales/da/messages.json",
+  "_locales/de/messages.json",
+  "_locales/el/messages.json",
+  "_locales/en_GB/messages.json",
+  "_locales/en/messages.json",
+  "_locales/es/messages.json",
+  "_locales/es_419/messages.json",
+  "_locales/et/messages.json",
+  "_locales/fa/messages.json",
+  "_locales/fi/messages.json",
+  "_locales/fil/messages.json",
+  "_locales/fr/messages.json",
+  "_locales/gu/messages.json",
+  "_locales/he/messages.json",
+  "_locales/hi/messages.json",
+  "_locales/hr/messages.json",
+  "_locales/hu/messages.json",
+  "_locales/id/messages.json",
+  "_locales/it/messages.json",
+  "_locales/ja/messages.json",
+  "_locales/kn/messages.json",
+  "_locales/ko/messages.json",
+  "_locales/lt/messages.json",
+  "_locales/lv/messages.json",
+  "_locales/ml/messages.json",
+  "_locales/mr/messages.json",
+  "_locales/ms/messages.json",
+  "_locales/nl/messages.json",
+  "_locales/nb/messages.json",
+  "_locales/pl/messages.json",
+  "_locales/pt_BR/messages.json",
+  "_locales/pt_PT/messages.json",
+  "_locales/ro/messages.json",
+  "_locales/ru/messages.json",
+  "_locales/sk/messages.json",
+  "_locales/sl/messages.json",
+  "_locales/sr/messages.json",
+  "_locales/sv/messages.json",
+  "_locales/sw/messages.json",
+  "_locales/ta/messages.json",
+  "_locales/te/messages.json",
+  "_locales/th/messages.json",
+  "_locales/tr/messages.json",
+  "_locales/uk/messages.json",
+  "_locales/vi/messages.json",
+  "_locales/zh_CN/messages.json",
+  "_locales/zh_TW/messages.json",
+]
+
+grit("colorenhancer_strings") {
+  source = "strings/accessibility_extensions_strings.grd"
+  outputs = locale_files
+  output_dir = "$root_out_dir/colorenhancer"
+  depfile_dir = "$root_out_dir"
+  resource_ids = ""
+}
+
+colorenhancer_files = [
+  "colorenhancer/manifest.json",
+  "colorenhancer/src/background.js",
+  "colorenhancer/src/common.js",
+  "colorenhancer/src/cvd.js",
+  "colorenhancer/src/popup.html",
+  "colorenhancer/src/popup.js",
+  "colorenhancer/src/storage.js",
+  "colorenhancer/res/cvd-128.png",
+  "colorenhancer/res/cvd-16.png",
+  "colorenhancer/res/cvd-19.png",
+  "colorenhancer/res/cvd-38.png",
+  "colorenhancer/res/cvd-48.png",
+  "colorenhancer/res/cvd.css",
+  "colorenhancer/res/setup.css",
+]
+
+copy("colorenhancer_copy") {
+  sources = colorenhancer_files
+  outputs = [
+    "$root_out_dir/{{source_target_relative}}",
+  ]
+}