Revert of Plugin Power Saver: Remove Size Recheck hack in plugin placeholders.

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/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
@@ skipping 70 matching lines @@
   v8::Local<v8::Object> GetV8ScriptableObject(
       v8::Isolate* isolate) const override;
   void OnUnobscuredRectUpdate(const gfx::Rect& unobscured_rect) override;
 
   // RenderFrameObserver methods:
   void WasShown() override;
 
   void UpdateMessage();
 
   bool LoadingBlocked() const;
+  void RecheckSizeAndMaybeUnthrottle();
 
   // Plugin creation is embedder-specific.
   virtual blink::WebPlugin* CreatePlugin() = 0;
 
   content::WebPluginInfo plugin_info_;
 
   base::string16 message_;
 
   // True if the plugin load was deferred due to page being a background tab.
   // Plugin may be automatically loaded when the page is foregrounded.
@@ skipping 11 matching lines @@
   bool power_saver_enabled_;
 
   // When we load, uses this premade plugin instead of creating a new one.
   content::PluginInstanceThrottler* premade_throttler_;
 
   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_