[scheduler] Monitor renderer load level.

third_party/WebKit/Source/platform/blink_platform.gypi

Index: third_party/WebKit/Source/platform/blink_platform.gypi
diff --git a/third_party/WebKit/Source/platform/blink_platform.gypi b/third_party/WebKit/Source/platform/blink_platform.gypi
index 01c3558123f3dc44a1ce8d9fa18c2251b8e9500d..c348bb94a8e5ee6a07fa165d3b7975238d447963 100644
--- a/third_party/WebKit/Source/platform/blink_platform.gypi
+++ b/third_party/WebKit/Source/platform/blink_platform.gypi
@@ -953,6 +953,8 @@
       'scheduler/base/task_queue_selector.cc',
       'scheduler/base/task_queue_selector.h',
       'scheduler/base/task_time_tracker.h',
+      'scheduler/base/thread_load_tracker.cc',
+      'scheduler/base/thread_load_tracker.h',
       'scheduler/base/time_domain.cc',
       'scheduler/base/time_domain.h',
       'scheduler/base/virtual_time_domain.cc',
@@ -961,7 +963,6 @@
       'scheduler/base/work_queue.h',
       'scheduler/base/work_queue_sets.cc',
       'scheduler/base/work_queue_sets.h',
-      'scheduler/CancellableTaskFactory.h',
       'scheduler/child/compositor_worker_scheduler.cc',
       'scheduler/child/idle_helper.cc',
       'scheduler/child/idle_helper.h',
@@ -986,14 +987,14 @@
       '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_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',
@@ -1004,10 +1005,10 @@
       'scheduler/renderer/user_model.h',
       'scheduler/renderer/web_frame_scheduler_impl.cc',
       'scheduler/renderer/web_frame_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/renderer/webthread_impl_for_renderer_scheduler.cc',
+      'scheduler/renderer/webthread_impl_for_renderer_scheduler.h',
       'scheduler/utility/webthread_impl_for_utility_thread.cc',
       'scroll/MainThreadScrollingReason.h',
       'scroll/ProgrammaticScrollAnimator.cpp',
@@ -1314,14 +1315,15 @@
       '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/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',
@@ -1335,8 +1337,8 @@
       'scheduler/renderer/task_cost_estimator_unittest.cc',
       'scheduler/renderer/throttling_helper_unittest.cc',
       'scheduler/renderer/user_model_unittest.cc',
-      'scheduler/renderer/webthread_impl_for_renderer_scheduler_unittest.cc',
       'scheduler/renderer/web_view_scheduler_impl_unittest.cc',
+      'scheduler/renderer/webthread_impl_for_renderer_scheduler_unittest.cc',
       'scroll/ScrollableAreaTest.cpp',
       'testing/ArenaTestHelpers.h',
       'testing/TreeTestHelpers.cpp',