Don't depend on the embedder creating a plugin. That way embedders can always provide an empty Co...

content/renderer/content_renderer_client.h

 // Copyright (c) 2011 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_CONTENT_RENDERER_CLIENT_H_
 #define CONTENT_RENDERER_CONTENT_RENDERER_CLIENT_H_
 #pragma once
 
 #include <string>
 
@@ skipping 35 matching lines @@
 
   // Sets a number of views/tabs opened in this process.
   virtual void SetNumberOfViews(int number_of_views) = 0;
 
   // Returns the bitmap to show when a plugin crashed, or NULL for none.
   virtual SkBitmap* GetSadPluginBitmap() = 0;
 
   // Returns the default text encoding.
   virtual std::string GetDefaultEncoding() = 0;
 
-  // Create a plugin in the given frame.  Can return NULL, in which case
-  // RenderView will create a plugin itself.
-  virtual WebKit::WebPlugin* CreatePlugin(
+  // Allows the embedder to override creating a plugin. If it returns true, then
+  // |plugin| will contain the created plugin, although it could be NULL. If it
+  // returns false, the content layer will create the plugin.
+  virtual bool OverrideCreatePlugin(
       RenderView* render_view,
       WebKit::WebFrame* frame,
-      const WebKit::WebPluginParams& params) = 0;
+      const WebKit::WebPluginParams& params,
+      WebKit::WebPlugin** plugin) = 0;
 
   // Give the embedder the ability to set an error page.
   virtual void ShowErrorPage(RenderView* render_view,
                              WebKit::WebFrame* frame,
                              int http_status_code) = 0;
 
   // Returns the html to display when a navigation error occurs.
   virtual std::string GetNavigationErrorHtml(
       const WebKit::WebURLRequest& failed_request,
       const WebKit::WebURLError& error) = 0;
@@ skipping 50 matching lines @@
   // Cookies to be set are passed in the value parameter.
   virtual bool HandleSetCookieRequest(RenderView* sender,
                                       const GURL& url,
                                       const GURL& first_party_for_cookies,
                                       const std::string& value) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_CONTENT_RENDERER_CLIENT_H_