Plugin Power Saver: Unthrottle dynamically sized plugins correctly.

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 34 matching lines @@
 // representative keyframe.
 class CONTENT_EXPORT PluginInstanceThrottler {
  public:
   // How the throttled power saver is unthrottled, if ever.
   // These numeric values are used in UMA logs; do not change them.
   enum PowerSaverUnthrottleMethod {
     UNTHROTTLE_METHOD_NEVER = 0,
     UNTHROTTLE_METHOD_BY_CLICK = 1,
     UNTHROTTLE_METHOD_BY_WHITELIST = 2,
     UNTHROTTLE_METHOD_BY_AUDIO = 3,
+    UNTHROTTLE_METHOD_BY_SIZE_CHANGE = 4,
     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);
 
+  // Returns true if content is considered "large", and thus essential.
+  static bool IsLargeContent(int width, int height);
+
   virtual ~PluginInstanceThrottler() {}
 
   virtual void AddObserver(Observer* observer) = 0;
   virtual void RemoveObserver(Observer* observer) = 0;
 
   virtual bool IsThrottled() const = 0;
   virtual bool IsHiddenForPlaceholder() const = 0;
 
   // Marks the plugin as essential. Unthrottles the plugin if already throttled.
   virtual void MarkPluginEssential(PowerSaverUnthrottleMethod method) = 0;
@@ skipping 12 matching lines @@
 
  protected:
   PluginInstanceThrottler() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PluginInstanceThrottler);
 };
 }
 
 #endif  // CONTENT_PUBLIC_RENDERER_PLUGIN_INSTANCE_THROTTLER_H_