Optimize posting of WTF::Closure and improve scheduler test mocks

third_party/WebKit/Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'ContentDecryptionModuleResult.h',
@@ skipping 1298 matching lines @@
       'mojo/KURLSecurityOriginTest.cpp',
       'network/EncodedFormDataTest.cpp',
       'network/HTTPParsersTest.cpp',
       'network/LinkHeaderTest.cpp',
       'network/NetworkUtilsTest.cpp',
       'network/ResourceRequestTest.cpp',
       'network/ResourceResponseTest.cpp',
       'scheduler/CancellableTaskFactoryTest.cpp',
       'scheduler/base/long_task_tracker_unittest.cc',
       'scheduler/base/queueing_time_estimator_unittest.cc',
-      'scheduler/base/task_queue_manager_delegate_for_test.cc',
       'scheduler/base/task_queue_manager_unittest.cc',
       'scheduler/base/task_queue_selector_unittest.cc',
       'scheduler/base/test_count_uses_time_source.cc',
-      'scheduler/base/test_time_source.cc',
       'scheduler/base/thread_load_tracker_unittest.cc',
       'scheduler/base/time_domain_unittest.cc',
       'scheduler/base/work_queue_sets_unittest.cc',
       'scheduler/child/idle_helper_unittest.cc',
       'scheduler/child/scheduler_helper_unittest.cc',
-      'scheduler/child/scheduler_tqm_delegate_for_test.cc',
       'scheduler/child/scheduler_tqm_delegate_impl_unittest.cc',
       'scheduler/child/webthread_impl_for_worker_scheduler_unittest.cc',
       'scheduler/child/worker_scheduler_impl_unittest.cc',
       'scheduler/renderer/auto_advancing_virtual_time_domain_unittest.cc',
       'scheduler/renderer/deadline_task_runner_unittest.cc',
       'scheduler/renderer/idle_time_estimator_unittest.cc',
       'scheduler/renderer/renderer_scheduler_impl_unittest.cc',
       'scheduler/renderer/task_cost_estimator_unittest.cc',
       'scheduler/renderer/throttling_helper_unittest.cc',
       'scheduler/renderer/user_model_unittest.cc',
@@ skipping 34 matching lines @@
       'graphics/DeferredImageDecoderTest.cpp',
       'graphics/GraphicsLayerTest.cpp',
       'graphics/ImageDecodingStoreTest.cpp',
       'graphics/ImageFrameGeneratorTest.cpp',
       'graphics/ImageLayerChromiumTest.cpp',
       'graphics/test/FakeGLES2Interface.h',
       'graphics/test/FakeWebGraphicsContext3DProvider.h',
       'graphics/test/MockImageDecoder.h',
     ],
     'platform_test_support_files': [
+      'scheduler/base/task_queue_manager_delegate_for_test.cc',
+      'scheduler/base/test_time_source.cc',
+      'scheduler/child/scheduler_tqm_delegate_for_test.cc',
       'scheduler/test/fake_renderer_scheduler.cc',
+      'scheduler/test/fake_web_task_runner.cc',
+      'scheduler/test/fake_web_task_runner.h',
       'scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.cc',
       'scheduler/test/lazy_scheduler_message_loop_delegate_for_tests.h',
       'scheduler/test/renderer_scheduler_test_support.cc',
       'scroll/ScrollbarTestSuite.h',
       'testing/CompositorTest.cpp',
       'testing/CompositorTest.h',
       'testing/FakeDisplayItemClient.h',
       'testing/FakeGraphicsLayer.h',
       'testing/FakeGraphicsLayerClient.h',
       'testing/FontTestHelpers.cpp',
@@ skipping 59 matching lines @@
       ['use_default_render_theme==1',
         {
           'platform_test_files': [
             'scroll/ScrollbarThemeAuraTest.cpp',
           ],
         }
       ],
     ],
   },
 }