Avoid redrawing Display when not damaged.

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 114 matching lines @@
       '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/display_unittest.cc',
       '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',
@@ skipping 312 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'cc_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }