Introduce ChildScheduler as common base interface for WorkerScheduler and RendererScheduler.

content/renderer/scheduler/renderer_scheduler.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_SCHEDULER_RENDERER_SCHEDULER_H_
 #define CONTENT_RENDERER_SCHEDULER_RENDERER_SCHEDULER_H_
 
 #include "base/message_loop/message_loop.h"
+#include "content/child/scheduler/child_scheduler.h"
 #include "content/child/scheduler/single_thread_idle_task_runner.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
 namespace cc {
 struct BeginFrameArgs;
 }
 
 namespace content {
 
-class CONTENT_EXPORT RendererScheduler {
+class CONTENT_EXPORT RendererScheduler : public ChildScheduler {
  public:
-  virtual ~RendererScheduler();
+  ~RendererScheduler() override;
   static scoped_ptr<RendererScheduler> Create();
 
-  // Returns the default task runner.
-  virtual scoped_refptr<base::SingleThreadTaskRunner> DefaultTaskRunner() = 0;
-
   // Returns the compositor task runner.
   virtual scoped_refptr<base::SingleThreadTaskRunner>
   CompositorTaskRunner() = 0;
 
-  // Returns the idle task runner. Tasks posted to this runner may be reordered
-  // relative to other task types and may be starved for an arbitrarily long
-  // time if no idle time is available.
-  virtual scoped_refptr<SingleThreadIdleTaskRunner> IdleTaskRunner() = 0;
-
   // Returns the loading task runner.  This queue is intended for tasks related
   // to resource dispatch, foreground HTML parsing, etc...
   virtual scoped_refptr<base::SingleThreadTaskRunner> LoadingTaskRunner() = 0;
 
   // Returns the timer task runner.  This queue is intended for DOM Timers.
   virtual scoped_refptr<base::SingleThreadTaskRunner> TimerTaskRunner() = 0;
 
   // Called to notify about the start of an extended period where no frames
   // need to be drawn. Must be called from the main thread.
   virtual void BeginFrameNotExpectedSoon() = 0;
@@ skipping 25 matching lines @@
   // The renderer is assumed to be visible when the scheduler is constructed.
   // Must be called on the main thread.
   virtual void OnRendererVisible() = 0;
 
   // Returns true if the scheduler has reason to believe that high priority work
   // may soon arrive on the main thread, e.g., if gesture events were observed
   // recently.
   // Must be called from the main thread.
   virtual bool IsHighPriorityWorkAnticipated() = 0;
 
-  // Returns true if there is high priority work pending on the main thread
-  // and the caller should yield to let the scheduler service that work. Note
-  // that this is a stricter condition than |IsHighPriorityWorkAnticipated|,
-  // restricted to the case where real work is pending.
-  // Must be called from the main thread.
-  virtual bool ShouldYieldForHighPriorityWork() = 0;
-
-  // Returns true if a currently running idle task could exceed its deadline
-  // without impacting user experience too much. This should only be used if
-  // there is a task which cannot be pre-empted and is likely to take longer
-  // than the largest expected idle task deadline. It should NOT be polled to
-  // check whether more work can be performed on the current idle task after
-  // its deadline has expired - post a new idle task for the continuation of the
-  // work in this case.
-  // Must be called from the main thread.
-  virtual bool CanExceedIdleDeadlineIfRequired() const = 0;
-
-  // Adds or removes a task observer from the scheduler. The observer will be
-  // notified before and after every executed task. These functions can only be
-  // called on the main thread.
-  virtual void AddTaskObserver(
-      base::MessageLoop::TaskObserver* task_observer) = 0;
-  virtual void RemoveTaskObserver(
-      base::MessageLoop::TaskObserver* task_observer) = 0;
-
-  // Shuts down the scheduler by dropping any remaining pending work in the work
-  // queues. After this call any work posted to the task runners will be
-  // silently dropped.
-  virtual void Shutdown() = 0;
-
   // Suspends the timer queue and increments the timer queue suspension count.
   // May only be called from the main thread.
   virtual void SuspendTimerQueue() = 0;
 
   // Decrements the timer queue suspension count and re-enables the timer queue
   // if the suspension count is zero and the current schduler policy allows it.
   virtual void ResumeTimerQueue() = 0;
 
  protected:
   RendererScheduler();
   DISALLOW_COPY_AND_ASSIGN(RendererScheduler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_SCHEDULER_RENDERER_SCHEDULER_H_