Adding run_at to chrome.tabs.executeScript/insertCss.

chrome/renderer/extensions/extension_helper.cc

 // Copyright (c) 2012 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/extensions/extension_helper.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/json/json_value_serializer.h"
@@ skipping 127 matching lines @@
 
 void ExtensionHelper::DidFinishLoad(WebKit::WebFrame* frame) {
   SchedulerMap::iterator i = g_schedulers.Get().find(frame);
   if (i != g_schedulers.Get().end())
     i->second->DidFinishLoad();
 }
 
 void ExtensionHelper::DidCreateDocumentElement(WebFrame* frame) {
   extension_dispatcher_->user_script_slave()->InjectScripts(
       frame, UserScript::DOCUMENT_START);
+  SchedulerMap::iterator i = g_schedulers.Get().find(frame);
+  if (i != g_schedulers.Get().end())
+    i->second->DidCreateDocumentElement();
 }
 
 void ExtensionHelper::DidStartProvisionalLoad(WebKit::WebFrame* frame) {
   SchedulerMap::iterator i = g_schedulers.Get().find(frame);
   if (i != g_schedulers.Get().end())
     i->second->DidStartProvisionalLoad();
 }
 
 void ExtensionHelper::FrameDetached(WebFrame* frame) {
   // This could be called before DidCreateDataSource, in which case the frame
@@ skipping 192 matching lines @@
       routing_id(), *pending_app_info_));
   pending_app_info_.reset(NULL);
 }
 
 void ExtensionHelper::AddErrorToRootConsole(const string16& message) {
   if (render_view()->GetWebView() && render_view()->GetWebView()->mainFrame()) {
     render_view()->GetWebView()->mainFrame()->addMessageToConsole(
         WebConsoleMessage(WebConsoleMessage::LevelError, message));
   }
 }