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

chrome/renderer/blocked_plugin.cc

 // Copyright (c) 2010 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 "chrome/renderer/blocked_plugin.h"
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "base/string_piece.h"
 #include "base/values.h"
@@ skipping 31 matching lines @@
 static const char* const kBlockedPluginDataURL = "chrome://blockedplugindata/";
 static const unsigned kMenuActionLoad = 1;
 static const unsigned kMenuActionRemove = 2;
 
 BlockedPlugin::BlockedPlugin(RenderView* render_view,
                              WebFrame* frame,
                              const webkit::npapi::PluginGroup& info,
                              const WebPluginParams& params,
                              const WebPreferences& preferences,
                              int template_id,
-                             const string16& message)
+                             const string16& message,
+                             bool is_blocked_for_prerendering)
     : RenderViewObserver(render_view),
       frame_(frame),
       plugin_params_(params),
-      custom_menu_showing_(false) {
+      custom_menu_showing_(false),
+      is_blocked_for_prerendering_(is_blocked_for_prerendering) {
   const base::StringPiece template_html(
       ResourceBundle::GetSharedInstance().GetRawDataResource(template_id));
 
   DCHECK(!template_html.empty()) << "unable to load template. ID: "
                                  << template_id;
 
   DictionaryValue values;
   values.SetString("message", message);
   name_ = info.GetGroupName();
   values.SetString("name", name_);
@@ skipping 57 matching lines @@
   if (custom_menu_showing_ &&
       message.type() == ViewMsg_CustomContextMenuAction::ID) {
     ViewMsg_CustomContextMenuAction::Dispatch(
         &message, this, this, &BlockedPlugin::OnMenuItemSelected);
     return true;
   }
 
   // Don't want to swallow these messages.
   if (message.type() == ViewMsg_LoadBlockedPlugins::ID) {
     LoadPlugin();
+  } else if (message.type() == ViewMsg_DisplayPrerenderedPage::ID) {
+    if (is_blocked_for_prerendering_)
+      LoadPlugin();
   } else if (message.type() == ViewMsg_ContextMenuClosed::ID) {
     custom_menu_showing_ = false;
   }
 
   return false;
 }
 
 void BlockedPlugin::OnMenuItemSelected(unsigned id) {
   if (id == kMenuActionLoad) {
     LoadPlugin();
@@ skipping 61 matching lines @@
       if (element.hasAttribute("style")) {
         WebString style_str = element.getAttribute("style");
         if (width_regex.match(style_str) >= 0 &&
             height_regex.match(style_str) >= 0)
           element.setAttribute("style", "display: none;");
       }
     }
   }
 }