Worker: Introduce per-global-scope task scheduler

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

Index: third_party/WebKit/Source/platform/scheduler/child/compositor_worker_scheduler.h
diff --git a/third_party/WebKit/Source/platform/scheduler/child/compositor_worker_scheduler.h b/third_party/WebKit/Source/platform/scheduler/child/compositor_worker_scheduler.h
index 031d66fe910ebbd97c650a81854cf1ee6e99862b..c930b1843a9030ba91fcd06319feaae5377bf120 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/compositor_worker_scheduler.h
+++ b/third_party/WebKit/Source/platform/scheduler/child/compositor_worker_scheduler.h
@@ -17,11 +17,16 @@ class Thread;
 namespace blink {
 namespace scheduler {
 
+class SchedulerTqmDelegate;
+class SchedulerHelper;
+
 class BLINK_PLATFORM_EXPORT CompositorWorkerScheduler
     : public WorkerScheduler,
       public SingleThreadIdleTaskRunner::Delegate {
  public:
-  explicit CompositorWorkerScheduler(base::Thread* thread);
+  CompositorWorkerScheduler(
+      base::Thread* thread,
+      scoped_refptr<SchedulerTqmDelegate> main_task_runner);
   ~CompositorWorkerScheduler() override;
 
   // WorkerScheduler:
@@ -37,6 +42,8 @@ class BLINK_PLATFORM_EXPORT CompositorWorkerScheduler
   void RemoveTaskObserver(
       base::MessageLoop::TaskObserver* task_observer) override;
   void Shutdown() override;
+  scoped_refptr<TaskQueue> NewUnthrottledTaskRunner(
+      TaskQueue::QueueType queue_type) override;
 
   // SingleThreadIdleTaskRunner::Delegate:
   void OnIdleTaskPosted() override;
@@ -46,6 +53,7 @@ class BLINK_PLATFORM_EXPORT CompositorWorkerScheduler
 
  private:
   base::Thread* thread_;
+  std::unique_ptr<SchedulerHelper> helper_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositorWorkerScheduler);
 };