Use Blink support to watch CSS selectors directly instead of using a MutationObserver.

content/renderer/render_view_impl.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 "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 3084 matching lines @@
 }
 
 void RenderViewImpl::frameDetached(WebFrame* frame) {
   FOR_EACH_OBSERVER(RenderViewObserver, observers_, FrameDetached(frame));
 }
 
 void RenderViewImpl::willClose(WebFrame* frame) {
   FOR_EACH_OBSERVER(RenderViewObserver, observers_, FrameWillClose(frame));
 }
 
+void RenderViewImpl::didMatchCSS(
+    WebFrame* frame,
+    const WebVector<WebString>& newlyMatchingSelectors,
+    const WebVector<WebString>& stoppedMatchingSelectors) {
+  FOR_EACH_OBSERVER(
+      RenderViewObserver, observers_,
+      DidMatchCSS(frame, newlyMatchingSelectors, stoppedMatchingSelectors));
+}
+
 void RenderViewImpl::Repaint(const gfx::Size& size) {
   OnRepaint(size);
 }
 
 void RenderViewImpl::SetEditCommandForNextKeyEvent(const std::string& name,
                                                    const std::string& value) {
   EditCommands edit_commands;
   edit_commands.push_back(EditCommand(name, value));
   OnSetEditCommandsForNextKeyEvent(edit_commands);
 }
@@ skipping 3390 matching lines @@
   for (size_t i = 0; i < icon_urls.size(); i++) {
     WebURL url = icon_urls[i].iconURL();
     if (!url.isEmpty())
       urls.push_back(FaviconURL(url,
                                 ToFaviconType(icon_urls[i].iconType())));
   }
   SendUpdateFaviconURL(urls);
 }
 
 }  // namespace content