Move renderer plugin code into a new component.

components/plugins/renderer/mobile_youtube_plugin.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_MOBILE_YOUTUBE_PLUGIN_H_
+#define COMPONENTS_PLUGINS_RENDERER_MOBILE_YOUTUBE_PLUGIN_H_
+
+#include "components/plugins/renderer/plugin_placeholder.h"
+
+namespace plugins {
+
+// Class representing placeholders for old style embedded youtube video on
+// mobile device. For old style embedded youtube video, it has a url in the form
+// of http://www.youtube.com/v/VIDEO_ID. This placeholder replaces the url with
+// a simple html page and clicking the play image redirects the user to the
+// mobile youtube app.
+class MobileYouTubePlugin : public PluginPlaceholder {
+ public:
+  MobileYouTubePlugin(content::RenderView* render_view,
+                      WebKit::WebFrame* frame,
+                      const WebKit::WebPluginParams& params,
+                      base::StringPiece& template_html,
+                      GURL placeholderDataUrl);

[Bernhard Bauer, 2013/09/13 20:04:10]

Nit: It's more common to pass GURLs as const-ref than by copy.

+
+  // Whether this is a youtube url.
+  static bool IsYouTubeURL(const GURL& url, const std::string& mime_type);
+
+ private:
+  // Opens a youtube app in the current tab.
+  void OpenYoutubeUrlCallback(const webkit_glue::CppArgumentList& args,
+                              webkit_glue::CppVariant* result);
+
+  // WebViewPlugin::Delegate (via PluginPlaceholder) method
+  virtual void BindWebFrame(WebKit::WebFrame* frame) OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(MobileYouTubePlugin);
+};
+
+}  // namespace plugins
+
+#endif  // COMPONENTS_PLUGINS_RENDERER_MOBILE_YOUTUBE_PLUGIN_H_