Purge memory before suspending timer queues when backgrounded.

third_party/WebKit/public/platform/scheduler/renderer/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 THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_
 #define THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 153 matching lines @@
   virtual bool IsHighPriorityWorkAnticipated() = 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;
 
-  // Sets whether to allow suspension of timers after the backgrounded signal is
-  // received via OnRendererBackgrounded. Defaults to disabled.
-  virtual void SetTimerQueueSuspensionWhenBackgroundedEnabled(bool enabled) = 0;
-
   // Sets the default blame context to which top level work should be
   // attributed in this renderer. |blame_context| must outlive this scheduler.
   virtual void SetTopLevelBlameContext(
       base::trace_event::BlameContext* blame_context) = 0;
 
   // The renderer scheduler maintains an estimated RAIL mode[1]. This observer
   // can be used to get notified when the mode changes. The observer will be
   // called on the main thread and must outlive this class.
   // [1]
   // https://developers.google.com/web/tools/chrome-devtools/profile/evaluate-performance/rail
   virtual void SetRAILModeObserver(RAILModeObserver* observer) = 0;
 
   // Returns whether or not the main thread appears unresponsive, based on the
   // length and frequency of recent main thread tasks. To be called from the
   // compositor thread.
   virtual bool MainThreadSeemsUnresponsive() = 0;
 
  protected:
   RendererScheduler();
   DISALLOW_COPY_AND_ASSIGN(RendererScheduler);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_