Add protobuf serialization to DisplayItemList

cc/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("//testing/test.gni")
 
 component("cc") {
   sources = [
     "animation/animation.cc",
     "animation/animation.h",
@@ skipping 274 matching lines @@
     "playback/compositing_display_item.cc",
     "playback/compositing_display_item.h",
     "playback/discardable_image_map.cc",
     "playback/discardable_image_map.h",
     "playback/display_item.cc",
     "playback/display_item.h",
     "playback/display_item_list.cc",
     "playback/display_item_list.h",
     "playback/display_item_list_settings.cc",
     "playback/display_item_list_settings.h",
+    "playback/display_item_proto_factory.cc",
+    "playback/display_item_proto_factory.h",
     "playback/display_list_raster_source.cc",
     "playback/display_list_raster_source.h",
     "playback/display_list_recording_source.cc",
     "playback/display_list_recording_source.h",
     "playback/draw_image.h",
     "playback/drawing_display_item.cc",
     "playback/drawing_display_item.h",
     "playback/filter_display_item.cc",
     "playback/filter_display_item.h",
     "playback/float_clip_display_item.cc",
@@ skipping 623 matching lines @@
     "//ui/gl",
     "//ui/gl:test_support",
   ]
 
   if (is_android) {
     isolate_file = "cc_perftests.isolate"
   }
 }
 # When adding support for isolates, please have a look at run-time dependencies
 # in the cc_unittests_run target in cc_tests.gyp.