Update from https://crrev.com/306901

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.
 
 component("cc") {
   sources = [
     "animation/animation.cc",
     "animation/animation.h",
     "animation/animation_curve.cc",
     "animation/animation_curve.h",
@@ skipping 44 matching lines @@
     "base/scoped_ptr_algorithm.h",
     "base/scoped_ptr_deque.h",
     "base/scoped_ptr_vector.h",
     "base/simple_enclosed_region.cc",
     "base/simple_enclosed_region.h",
     "base/swap_promise.h",
     "base/swap_promise_monitor.cc",
     "base/swap_promise_monitor.h",
     "base/switches.cc",
     "base/switches.h",
+    "base/synced_property.h",
     "base/tiling_data.cc",
     "base/tiling_data.h",
     "base/time_util.h",
     "base/unique_notifier.cc",
     "base/unique_notifier.h",
     "base/util.h",
     "debug/benchmark_instrumentation.cc",
     "debug/benchmark_instrumentation.h",
     "debug/debug_colors.cc",
     "debug/debug_colors.h",
@@ skipping 777 matching lines @@
     "//gpu/command_buffer/common:gles2_utils",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//testing/perf",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
   ]
 }