Update from https://crrev.com/308996

cc/cc_tests.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'cc_unit_tests_source_files': [
       'animation/animation_unittest.cc',
       'animation/keyframed_animation_curve_unittest.cc',
@@ skipping 107 matching lines @@
       'trees/layer_tree_host_unittest_delegated.cc',
       'trees/layer_tree_host_unittest_occlusion.cc',
       'trees/layer_tree_host_unittest_no_message_loop.cc',
       'trees/layer_tree_host_unittest_picture.cc',
       'trees/layer_tree_host_unittest_proxy.cc',
       'trees/layer_tree_host_unittest_scroll.cc',
       'trees/layer_tree_host_unittest_video.cc',
       'trees/layer_tree_impl_unittest.cc',
       'trees/occlusion_tracker_unittest.cc',
       'trees/occlusion_unittest.cc',
+      'trees/property_tree_unittest.cc',
       'trees/tree_synchronizer_unittest.cc',
     ],
     'cc_surfaces_unit_tests_source_files': [
       'surfaces/surface_aggregator_test_helpers.cc',
       'surfaces/surface_aggregator_test_helpers.h',
       'surfaces/surface_aggregator_unittest.cc',
       'surfaces/surface_factory_unittest.cc',
       'surfaces/surface_unittest.cc',
       'surfaces/surfaces_pixeltest.cc',
     ],
     'cc_tests_support_files': [
       'test/animation_test_common.cc',
       'test/animation_test_common.h',
       'test/begin_frame_args_test.cc',
       'test/begin_frame_args_test.h',
       'test/fake_content_layer.cc',
       'test/fake_content_layer.h',
       'test/fake_content_layer_client.cc',
       'test/fake_content_layer_client.h',
       'test/fake_content_layer_impl.cc',
       'test/fake_content_layer_impl.h',
       'test/fake_delegated_renderer_layer.cc',
       'test/fake_delegated_renderer_layer.h',
       'test/fake_delegated_renderer_layer_impl.cc',
       'test/fake_delegated_renderer_layer_impl.h',
+      'test/fake_external_begin_frame_source.cc',
+      'test/fake_external_begin_frame_source.h',
       'test/fake_impl_proxy.h',
       'test/fake_layer_tree_host.cc',
       'test/fake_layer_tree_host.h',
       'test/fake_layer_tree_host_client.cc',
       'test/fake_layer_tree_host_client.h',
       'test/fake_layer_tree_host_impl.cc',
       'test/fake_layer_tree_host_impl.h',
       'test/fake_layer_tree_host_impl_client.cc',
       'test/fake_layer_tree_host_impl_client.h',
       'test/fake_output_surface.cc',
@@ skipping 271 matching lines @@
             'variables': {
               'test_suite_name': 'cc_perftests',
             },
             'includes': [ '../build/apk_test.gypi' ],
           },
         ],
       }
     ]
   ],
 }