Add ResumeRenderer to RendererScheduler for Purge+Suspend.

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 116 matching lines @@
   // Tells the scheduler that the renderer process has been foregrounded.
   // This is the assumed state when the scheduler is constructed.
   // Must be called on the main thread.
   virtual void OnRendererForegrounded() = 0;
 
   // Tells the scheduler that the render process should be suspended. This can
   // only be done when the renderer is backgrounded. The renderer will be
   // automatically resumed when foregrounded.
   virtual void SuspendRenderer() = 0;
 
+  // Tells the scheduler that the render process should be resumed. This can
+  // only be done when the renderer is suspended. TabManager (in the future,
+  // MemoryCoordinator) will suspend the renderer again if continuously
+  // backgrounded.
+  virtual void ResumeRenderer() = 0;
+
   // Tells the scheduler that a navigation task is pending. While any main-frame
   // navigation tasks are pending, the scheduler will ensure that loading tasks
   // are not blocked even if they are expensive. Must be called on the main
   // thread.
   virtual void AddPendingNavigation(WebScheduler::NavigatingFrameType type) = 0;
 
   // Tells the scheduler that a navigation task is no longer pending.
   // Must be called on the main thread.
   virtual void RemovePendingNavigation(
       WebScheduler::NavigatingFrameType type) = 0;
@@ skipping 35 matching lines @@
 
  protected:
   RendererScheduler();
   DISALLOW_COPY_AND_ASSIGN(RendererScheduler);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_