Plugin Power Saver: Do not always throttle plugins with posters.

components/plugins/renderer/loadable_plugin_placeholder.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 COMPONENTS_PLUGINS_RENDERER_LOADABLE_PLUGIN_PLACEHOLDER_H_
 #define COMPONENTS_PLUGINS_RENDERER_LOADABLE_PLUGIN_PLACEHOLDER_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
 #include "components/plugins/renderer/plugin_placeholder.h"
@@ skipping 105 matching lines @@
   bool allow_loading_;
 
   bool finished_loading_;
   std::string identifier_;
 
   // Used to prevent re-entrancy during the size recheck for throttled plugins.
   bool in_size_recheck_;
   gfx::Rect unobscured_rect_;
   base::OneShotTimer size_update_timer_;
 
+  // True if the power saver heuristic has already been run on this content.
+  bool heuristic_run_before_;
+
   base::WeakPtrFactory<LoadablePluginPlaceholder> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LoadablePluginPlaceholder);
 };
 
 }  // namespace plugins
 
 #endif  // COMPONENTS_PLUGINS_RENDERER_LOADABLE_PLUGIN_PLACEHOLDER_H_