Generate FrameTree::uniqueName with a URL attribute value.

Source/web/WebFrameImpl.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 1670 matching lines @@
 PassRefPtr<LocalFrame> WebFrameImpl::createChildFrame(const FrameLoadRequest& request, HTMLFrameOwnerElement* ownerElement)
 {
     ASSERT(m_client);
     WebFrameImpl* webframe = toWebFrameImpl(m_client->createChildFrame(this, request.frameName()));
     if (!webframe)
         return nullptr;
 
     RefPtr<LocalFrame> childFrame = LocalFrame::create(&webframe->m_frameLoaderClientImpl, frame()->host(), ownerElement);
     webframe->setWebCoreFrame(childFrame);
 
-    childFrame->tree().setName(request.frameName());
+    // FIXME: Using subResourceAttributeName as fallback is not a perfect
+    // solution. subResourceAttributeName returns just one attribute name. The
+    // element might not have the attribute, and there might be other attributes
+    // which can identify the element.
+    childFrame->tree().setName(request.frameName(), ownerElement->getAttribute(ownerElement->subResourceAttributeName()));
 
     // FIXME: This comment is not quite accurate anymore.
     // LocalFrame::init() can trigger onload event in the parent frame,
     // which may detach this frame and trigger a null-pointer access
     // in FrameTree::removeChild. Move init() after appendChild call
     // so that webframe->mFrame is in the tree before triggering
     // onload event handler.
     // Because the event handler may set webframe->mFrame to null,
     // it is necessary to check the value after calling init() and
     // return without loading URL.
@@ skipping 265 matching lines @@
 
 void WebFrameImpl::invalidateAll() const
 {
     ASSERT(frame() && frame()->view());
     FrameView* view = frame()->view();
     view->invalidateRect(view->frameRect());
     invalidateScrollbar();
 }
 
 } // namespace blink