Don't load plugins on prerendered pages until the pages are displayed....

chrome/common/render_messages_internal.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.
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "build/build_config.h"
@@ skipping 549 matching lines @@
 IPC_MESSAGE_ROUTED0(ViewMsg_InstallMissingPlugin)
 
 // Tells the renderer to empty its plugin list cache, optional reloading
 // pages containing plugins.
 IPC_MESSAGE_CONTROL1(ViewMsg_PurgePluginListCache,
                      bool /* reload_pages */)
 
 // Tells the render view to load all blocked plugins.
 IPC_MESSAGE_ROUTED0(ViewMsg_LoadBlockedPlugins)
 
+// Tells the render view a prerendered page is about to be displayed.
+IPC_MESSAGE_ROUTED0(ViewMsg_DisplayPrerenderedPage)
+
 IPC_MESSAGE_ROUTED1(ViewMsg_RunFileChooserResponse,
                     std::vector<FilePath> /* selected files */)
 
 // Used to instruct the RenderView to go into "view source" mode.
 IPC_MESSAGE_ROUTED0(ViewMsg_EnableViewSourceMode)
 
 // Get all savable resource links from current webpage, include main
 // frame and sub-frame.
 IPC_MESSAGE_ROUTED1(ViewMsg_GetAllSavableResourceLinksForCurrentPage,
                     GURL /* url of page which is needed to save */)
@@ skipping 2050 matching lines @@
                      int /* request_id */,
                      PP_Flash_NetAddress /* addr */)
 
 // JavaScript related messages -----------------------------------------------
 
 // Notify the JavaScript engine in the render to change its parameters
 // while performing stress testing.
 IPC_MESSAGE_ROUTED2(ViewMsg_JavaScriptStressTestControl,
                     int /* cmd */,
                     int /* param */)