Support touch icon in FaviconHelper

content/browser/tab_contents/tab_contents.h

Index: content/browser/tab_contents/tab_contents.h
diff --git a/content/browser/tab_contents/tab_contents.h b/content/browser/tab_contents/tab_contents.h
index c541425cec81ce18a7daf8c74a1a005d1781ca34..24c17ce94cb8b977b167d07590ee7d3310fcc0ea 100644
--- a/content/browser/tab_contents/tab_contents.h
+++ b/content/browser/tab_contents/tab_contents.h
@@ -800,6 +800,9 @@ class TabContents : public PageNavigator,
                         InstantCompleteBehavior behavior);
   void OnInstantSupportDetermined(int32 page_id, bool result);
 
+  void OnUpdateFaviconURL(int32 page_id,
+                          const std::vector<FaviconURL>& candidates);
+
   // Changes the IsLoading state and notifies delegate as needed
   // |details| is used to provide details on the load that just finished
   // (but can be null if not applicable). Can be overridden.
@@ -1082,6 +1085,10 @@ class TabContents : public PageNavigator,
   // Handles downloading favicons.
   scoped_ptr<FaviconHelper> favicon_helper_;
 
+  // Handles downloading touchicons. It is NULL if
+  // browser_defaults::kEnableTouchIcon is false.
+  scoped_ptr<FaviconHelper> touch_icon_helper_;
+
   // Cached web app info data.
   WebApplicationInfo web_app_info_;