Using the new webkit CSS change notification instead of a mutation observer.

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_string_value_serializer.h"
 #include "base/lazy_instance.h"
 #include "base/message_loop.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension_messages.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/common/view_type.h"
 #include "chrome/renderer/extensions/chrome_v8_context.h"
+#include "chrome/renderer/extensions/content_watcher.h"
 #include "chrome/renderer/extensions/dispatcher.h"
 #include "chrome/renderer/extensions/miscellaneous_bindings.h"
 #include "chrome/renderer/extensions/user_script_scheduler.h"
 #include "chrome/renderer/extensions/user_script_slave.h"
 #include "content/public/renderer/render_view.h"
 #include "content/public/renderer/render_view_visitor.h"
 #include "extensions/common/constants.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebURLRequest.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebConsoleMessage.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
@@ skipping 114 matching lines @@
 
 ExtensionHelper::ExtensionHelper(content::RenderView* render_view,
                                  Dispatcher* dispatcher)
     : content::RenderViewObserver(render_view),
       content::RenderViewObserverTracker<ExtensionHelper>(render_view),
       dispatcher_(dispatcher),
       pending_app_icon_requests_(0),
       view_type_(chrome::VIEW_TYPE_INVALID),
       tab_id_(-1),
       browser_window_id_(-1) {
+  dispatcher_->content_watcher()->OnWebViewCreated(render_view->GetWebView());
 }
 
 ExtensionHelper::~ExtensionHelper() {
 }
 
 bool ExtensionHelper::InstallWebApplicationUsingDefinitionFile(
     WebFrame* frame, string16* error) {
   // There is an issue of drive-by installs with the below implementation. A web
   // site could force a user to install an app by timing the dialog to come up
   // just before the user clicks.
@@ skipping 113 matching lines @@
   // This could be called before DidCreateDataSource, in which case the frame
   // won't be in the map.
   SchedulerMap::iterator i = g_schedulers.Get().find(frame);
   if (i == g_schedulers.Get().end())
     return;
 
   delete i->second;
   g_schedulers.Get().erase(i);
 }
 
+void ExtensionHelper::CssMatches(
+    WebKit::WebFrame* frame,
+    const WebKit::WebVector<WebKit::WebString>& newlyMatchingSelectors,
+    const WebKit::WebVector<WebKit::WebString>& stoppedMatchingSelectors) {
+  dispatcher_->CssMatches(frame, newlyMatchingSelectors,
+                          stoppedMatchingSelectors);
+}
+
 void ExtensionHelper::DidCreateDataSource(WebFrame* frame, WebDataSource* ds) {
   // If there are any app-related fetches in progress, they can be cancelled now
   // since we have navigated away from the page that created them.
   if (!frame->parent()) {
     app_icon_fetchers_.clear();
     app_definition_fetcher_.reset(NULL);
   }
 
   // Check first if we created a scheduler for the frame, since this function
   // gets called for navigations within the document.
@@ skipping 241 matching lines @@
       case content::CONSOLE_MESSAGE_LEVEL_ERROR:
         target_level = WebConsoleMessage::LevelError;
         break;
     }
     render_view()->GetWebView()->mainFrame()->addMessageToConsole(
         WebConsoleMessage(target_level, message));
   }
 }
 
 }  // namespace extensions