Implement accessibility support for CSS-transformed iframes.

ui/accessibility/BUILD.gn

 # Copyright 2014 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/linux/pkg_config.gni")
 import("//build/config/ui.gni")
 import("//build/json_schema_api.gni")
 import("//testing/test.gni")
 if (is_android) {
   import("//build/config/android/rules.gni")
@@ skipping 123 matching lines @@
     "ax_tree_serializer_unittest.cc",
     "ax_tree_unittest.cc",
     "platform/ax_platform_node_win_unittest.cc",
   ]
 
   deps = [
     ":accessibility",
     ":test_support",
     "//base",
     "//base/test:run_all_unittests",
+    "//skia",
     "//testing/gtest",
     "//ui/base",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 
   if (is_win) {
     deps += [ "//third_party/iaccessible2" ]
   }
 }
 
 json_schema_api("ax_gen") {
   sources = [
     "ax_enums.idl",
   ]
   deps = [
     "//base/third_party/dynamic_annotations",
   ]
   root_namespace = "ui"
   schemas = true
 }