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

components/plugins/renderer/plugin_placeholder.h

 // Copyright 2013 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_PLUGIN_PLACEHOLDER_H_
 #define COMPONENTS_PLUGINS_RENDERER_PLUGIN_PLACEHOLDER_H_
 
 #include "base/memory/weak_ptr.h"
 #include "components/plugins/renderer/webview_plugin.h"
 #include "content/public/renderer/render_frame_observer.h"
@@ skipping 17 matching lines @@
                     blink::WebLocalFrame* frame,
                     const blink::WebPluginParams& params,
                     const std::string& html_data,
                     GURL placeholderDataUrl);
 
   ~PluginPlaceholder() override;
 
   blink::WebLocalFrame* GetFrame();
   const blink::WebPluginParams& GetPluginParams() const;
 
- private:
   // WebViewPlugin::Delegate methods:
   void ShowContextMenu(const blink::WebMouseEvent&) override;
   void PluginDestroyed() override;
 
+ private:
   // RenderFrameObserver methods:
   void OnDestruct() override;
 
   blink::WebLocalFrame* frame_;
   blink::WebPluginParams plugin_params_;
   WebViewPlugin* plugin_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginPlaceholder);
 };
 
 }  // namespace plugins
 
 #endif  // COMPONENTS_PLUGINS_RENDERER_PLUGIN_PLACEHOLDER_H_