Split content script injections into multiple tasks

chrome/renderer/extensions/chrome_extensions_renderer_client.h

 // Copyright 2014 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 CHROME_RENDERER_EXTENSIONS_CHROME_EXTENSIONS_RENDERER_CLIENT_H_
 #define CHROME_RENDERER_EXTENSIONS_CHROME_EXTENSIONS_RENDERER_CLIENT_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 56 matching lines @@
                          bool is_initial_navigation,
                          bool is_server_redirect,
                          bool* send_referrer);
   static content::BrowserPluginDelegate* CreateBrowserPluginDelegate(
       content::RenderFrame* render_frame,
       const std::string& mime_type,
       const GURL& original_url);
 
   void RunScriptsAtDocumentStart(content::RenderFrame* render_frame);
   void RunScriptsAtDocumentEnd(content::RenderFrame* render_frame);
+  void RunScriptsAtDocumentIdle(content::RenderFrame* render_frame);
 
   extensions::Dispatcher* extension_dispatcher() {
     return extension_dispatcher_.get();
   }
 
  private:
   std::unique_ptr<ChromeExtensionsDispatcherDelegate>
       extension_dispatcher_delegate_;
   std::unique_ptr<extensions::Dispatcher> extension_dispatcher_;
   std::unique_ptr<extensions::RendererPermissionsPolicyDelegate>
       permissions_policy_delegate_;
   std::unique_ptr<extensions::ExtensionsGuestViewContainerDispatcher>
       guest_view_container_dispatcher_;
   std::unique_ptr<extensions::ResourceRequestPolicy> resource_request_policy_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeExtensionsRendererClient);
 };
 
 #endif  // CHROME_RENDERER_EXTENSIONS_CHROME_EXTENSIONS_RENDERER_CLIENT_H_