[scheduler] Monitor renderer load level.

third_party/WebKit/Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'ContentDecryptionModuleResult.h',
@@ skipping 968 matching lines @@
       'scheduler/child/webthread_impl_for_worker_scheduler.cc',
       'scheduler/child/worker_scheduler.cc',
       'scheduler/child/worker_scheduler_impl.cc',
       'scheduler/child/worker_scheduler_impl.h',
       'scheduler/renderer/auto_advancing_virtual_time_domain.cc',
       'scheduler/renderer/auto_advancing_virtual_time_domain.h',
       'scheduler/renderer/deadline_task_runner.cc',
       'scheduler/renderer/deadline_task_runner.h',
       'scheduler/renderer/idle_time_estimator.cc',
       'scheduler/renderer/idle_time_estimator.h',
+      'scheduler/renderer/render_widget_scheduling_state.cc',
+      'scheduler/renderer/render_widget_signals.cc',
+      'scheduler/renderer/render_widget_signals.h',
+      'scheduler/renderer/renderer_load_tracker.cc',
+      'scheduler/renderer/renderer_load_tracker.h',
       'scheduler/renderer/renderer_scheduler.cc',
       'scheduler/renderer/renderer_scheduler_impl.cc',
       'scheduler/renderer/renderer_scheduler_impl.h',
       'scheduler/renderer/renderer_web_scheduler_impl.cc',
       'scheduler/renderer/renderer_web_scheduler_impl.h',
-      'scheduler/renderer/render_widget_scheduling_state.cc',
-      'scheduler/renderer/render_widget_signals.cc',
-      'scheduler/renderer/render_widget_signals.h',
       'scheduler/renderer/task_cost_estimator.cc',
       'scheduler/renderer/task_cost_estimator.h',
       'scheduler/renderer/throttled_time_domain.cc',
       'scheduler/renderer/throttled_time_domain.h',
       'scheduler/renderer/throttling_helper.cc',
       'scheduler/renderer/throttling_helper.h',
       'scheduler/renderer/user_model.cc',
       'scheduler/renderer/user_model.h',
       'scheduler/renderer/web_frame_scheduler_impl.cc',
       'scheduler/renderer/web_frame_scheduler_impl.h',
+      'scheduler/renderer/web_view_scheduler_impl.cc',
+      'scheduler/renderer/web_view_scheduler_impl.h',
       'scheduler/renderer/webthread_impl_for_renderer_scheduler.cc',
       'scheduler/renderer/webthread_impl_for_renderer_scheduler.h',
-      'scheduler/renderer/web_view_scheduler_impl.cc',
-      'scheduler/renderer/web_view_scheduler_impl.h',
       'scheduler/utility/webthread_impl_for_utility_thread.cc',
       'scroll/MainThreadScrollingReason.h',
       'scroll/ProgrammaticScrollAnimator.cpp',
       'scroll/ProgrammaticScrollAnimator.h',
       'scroll/ScrollAnimatorBase.cpp',
       'scroll/ScrollAnimatorBase.h',
       'scroll/ScrollAnimatorCompositorCoordinator.cpp',
       'scroll/ScrollAnimatorCompositorCoordinator.h',
       'scroll/ScrollAnimator.cpp',
       'scroll/ScrollAnimator.h',
@@ skipping 303 matching lines @@
       'scheduler/base/queueing_time_estimator_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_load_tracker_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',
+      'scheduler/renderer/web_view_scheduler_impl_unittest.cc',
       'scheduler/renderer/webthread_impl_for_renderer_scheduler_unittest.cc',
-      'scheduler/renderer/web_view_scheduler_impl_unittest.cc',
       'scroll/ScrollableAreaTest.cpp',
       'testing/ArenaTestHelpers.h',
       'testing/TreeTestHelpers.cpp',
       'testing/TreeTestHelpers.h',
       'text/BidiResolverTest.cpp',
       'text/CharacterTest.cpp',
       'text/DateTimeFormatTest.cpp',
       'text/HyphenationTest.cpp',
       'text/SegmentedStringTest.cpp',
       'text/TextBreakIteratorTest.cpp',
@@ skipping 102 matching lines @@
       ['use_default_render_theme==1',
         {
           'platform_test_files': [
             'scroll/ScrollbarThemeAuraTest.cpp',
           ],
         }
       ],
     ],
   },
 }