Detect <link rel='manifest'> and notify embedder.

Source/web/WebLocalFrameImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 730 matching lines @@
     return WebDocument(frame()->document());
 }
 
 WebPerformance WebLocalFrameImpl::performance() const
 {
     if (!frame())
         return WebPerformance();
     return WebPerformance(&frame()->domWindow()->performance());
 }
 
+WebURL WebLocalFrameImpl::manifestURL() const
+{
+    return frame()->document()->manifestURL();
+}
+
 bool WebLocalFrameImpl::dispatchBeforeUnloadEvent()
 {
     if (!frame())
         return true;
     return frame()->loader().shouldClose();
 }
 
 void WebLocalFrameImpl::dispatchUnloadEvent()
 {
     if (!frame())
@@ skipping 1219 matching lines @@
 
 void WebLocalFrameImpl::invalidateAll() const
 {
     ASSERT(frame() && frame()->view());
     FrameView* view = frame()->view();
     view->invalidateRect(view->frameRect());
     invalidateScrollbar();
 }
 
 } // namespace blink