Plugin Power Saver: Add UI Overlay to throttled plugin using placeholder.

content/renderer/pepper/plugin_instance_throttler_impl.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 CONTENT_RENDERER_PEPPER_PLUGIN_INSTANCE_THROTTLER_IMPL_H_
 #define CONTENT_RENDERER_PEPPER_PLUGIN_INSTANCE_THROTTLER_IMPL_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
@@ skipping 17 matching lines @@
                               const GURL& plugin_url,
                               bool power_saver_enabled);
 
   ~PluginInstanceThrottlerImpl() override;
 
   // PluginInstanceThrottler implementation:
   void AddObserver(Observer* observer) override;
   void RemoveObserver(Observer* observer) override;
   bool IsThrottled() const override;
   void MarkPluginEssential(PowerSaverUnthrottleMethod method) override;
+  void SetHiddenForPlaceholder(bool hidden) override;
 
   bool needs_representative_keyframe() const {
     return state_ == POWER_SAVER_ENABLED_AWAITING_KEYFRAME;
   }
 
   bool power_saver_enabled() const {
     return state_ == POWER_SAVER_ENABLED_AWAITING_KEYFRAME ||
            state_ == POWER_SAVER_ENABLED_PLUGIN_THROTTLED;
   }
 
@@ skipping 15 matching lines @@
     // We've chosen a keyframe and the plug-in is throttled.
     POWER_SAVER_ENABLED_PLUGIN_THROTTLED,
     // Plugin instance is no longer considered peripheral. This can happen from
     // a user click, whitelisting, or some other reason. We can end up in this
     // state regardless of whether power saver is enabled.
     PLUGIN_INSTANCE_MARKED_ESSENTIAL
   };
 
   void EngageThrottle();
 
+  void TimeoutKeyframeExtraction();
+
   State state_;
 
   // Number of consecutive interesting frames we've encountered.
   int consecutive_interesting_frames_;
 
+  // If true, take the next frame as the keyframe regardless of interestingness.
+  bool keyframe_extraction_timed_out_;
+
   ObserverList<Observer> observer_list_;
 
   base::WeakPtrFactory<PluginInstanceThrottlerImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginInstanceThrottlerImpl);
 };
 }
 
 #endif  // CONTENT_RENDERER_PEPPER_PLUGIN_INSTANCE_THROTTLER_IMPL_H_