WorkerThread CPU Load UMA

third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.h

Index: third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.h
diff --git a/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.h b/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.h
index 9742e4b8cb990402631f62631899f2c0741b3814..00620b51548ed4045d55f5ed8c2c9f3994407cc7 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.h
+++ b/third_party/WebKit/Source/platform/scheduler/child/worker_scheduler_impl.h
@@ -6,9 +6,11 @@
 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_CHILD_WORKER_SCHEDULER_IMPL_H_
 
 #include "base/macros.h"
+#include "platform/scheduler/base/thread_load_tracker.h"
 #include "platform/scheduler/child/idle_canceled_delayed_task_sweeper.h"
 #include "platform/scheduler/child/idle_helper.h"
 #include "platform/scheduler/child/scheduler_helper.h"
+#include "public/platform/scheduler/base/task_time_observer.h"
 #include "public/platform/scheduler/child/worker_scheduler.h"
 
 namespace blink {
@@ -17,7 +19,8 @@ namespace scheduler {
 class SchedulerTqmDelegate;
 
 class BLINK_PLATFORM_EXPORT WorkerSchedulerImpl : public WorkerScheduler,
-                                                  public IdleHelper::Delegate {
+                                                  public IdleHelper::Delegate,
+                                                  public TaskTimeObserver {
  public:
   explicit WorkerSchedulerImpl(
       scoped_refptr<SchedulerTqmDelegate> main_task_runner);
@@ -34,6 +37,13 @@ class BLINK_PLATFORM_EXPORT WorkerSchedulerImpl : public WorkerScheduler,
   void Init() override;
   void Shutdown() override;
 
+  // TaskTimeObserver implementation:
+  void willProcessTask(TaskQueue* task_queue, double start_time) override;
+  void didProcessTask(TaskQueue* task_queue,
+                      double start_time,
+                      double end_time) override;
+  void onBeginNestedMessageLoop() override;
+
   SchedulerHelper* GetSchedulerHelperForTesting();
   base::TimeTicks CurrentIdleTaskDeadlineForTesting() const;
 
@@ -52,6 +62,7 @@ class BLINK_PLATFORM_EXPORT WorkerSchedulerImpl : public WorkerScheduler,
   SchedulerHelper helper_;
   IdleHelper idle_helper_;
   IdleCanceledDelayedTaskSweeper idle_canceled_delayed_task_sweeper_;
+  ThreadLoadTracker load_tracker_;
   bool initialized_;
   base::TimeTicks thread_start_time_;