[scheduler] Implement time-based cpu throttling.

third_party/WebKit/public/platform/scheduler/base/task_queue.h

 // Copyright 2015 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 THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_BASE_TASK_QUEUE_H_
 #define THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_BASE_TASK_QUEUE_H_
 
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 126 matching lines @@
   // Enable or disable task execution for this queue. NOTE this must be called
   // on the thread this TaskQueue was created by.
   virtual void SetQueueEnabled(bool enabled) = 0;
 
   // NOTE this must be called on the thread this TaskQueue was created by.
   virtual bool IsQueueEnabled() const = 0;
 
   // Returns true if the queue is completely empty.
   virtual bool IsEmpty() const = 0;
 
-  // Returns true if the queue has work that's ready to execute now. NOTE this
-  // must be called on the thread this TaskQueue was created by.
+  // Returns true if the queue has work that's ready to execute now.
+  // NOTE: this must be called on the thread this TaskQueue was created by.
   virtual bool HasPendingImmediateWork() const = 0;
 
+  // Returns true if the queue has delayed tasks which are not ready to run.
+  // If result is true, sets |wakeup| to the time of next delayed task.
+  // NOTE: this must be called on the thread this TaskQueue was created by.
+  virtual bool NextScheduledWakeUp(base::TimeTicks* wakeup) = 0;

[Sami, 2016/09/07 15:20:44]

nit: GetNext... to match the naming around here.

nit: wake_up

[altimin, 2016/09/09 15:43:58]

Done.

+
   // Can be called on any thread.
   virtual const char* GetName() const = 0;
 
   // Set the priority of the queue to |priority|. NOTE this must be called on
   // the thread this TaskQueue was created by.
   virtual void SetQueuePriority(QueuePriority priority) = 0;
 
   // Returns the current queue priority.
   virtual QueuePriority GetQueuePriority() const = 0;
 
@@ skipping 33 matching lines @@
  protected:
   ~TaskQueue() override {}
 
   DISALLOW_COPY_AND_ASSIGN(TaskQueue);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_BASE_TASK_QUEUE_H_