Plugin Power Saver: Make PPS work well with prerendered pages.

content/public/renderer/plugin_instance_throttler.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 CONTENT_PUBLIC_RENDERER_PLUGIN_INSTANCE_THROTTLER_H_
 #define CONTENT_PUBLIC_RENDERER_PLUGIN_INSTANCE_THROTTLER_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/content_export.h"
@@ skipping 44 matching lines @@
     UNTHROTTLE_METHOD_NUM_ITEMS
   };
 
   class Observer {
    public:
     // Guaranteed to be called before the throttle is engaged.
     virtual void OnKeyframeExtracted(const SkBitmap* bitmap) {}
 
     virtual void OnThrottleStateChange() {}
 
+    virtual void OnPeripheralStateChange() {}
+
     // Called when the plugin should be hidden due to a placeholder.
     virtual void OnHiddenForPlaceholder(bool hidden) {}
 
     virtual void OnThrottlerDestroyed() {}
   };
 
   static scoped_ptr<PluginInstanceThrottler> Create();
 
   static void RecordUnthrottleMethodMetric(PowerSaverUnthrottleMethod method);
 
@@ skipping 22 matching lines @@
 
  protected:
   PluginInstanceThrottler() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PluginInstanceThrottler);
 };
 }
 
 #endif  // CONTENT_PUBLIC_RENDERER_PLUGIN_INSTANCE_THROTTLER_H_