Add HTMLPictureElement-based source selection to HTMLImageElement

Source/core/html/parser/HTMLSrcsetParser.h

 /*
  * Copyright (C) 2013 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 58 matching lines @@
         , m_resourceWidth(result.resourceWidth)
         , m_originAttribute(originAttribute)
     {
     }
 
     String toString() const
     {
         return String(m_string.toString());
     }
 
-    AtomicString toAtomicString() const
+    AtomicString url() const
     {
         return AtomicString(m_string.toString());
     }
 
     void setScaleFactor(float factor)
     {
         m_scaleFactor = factor;
     }
 
     float scaleFactor() const
@@ skipping 25 matching lines @@
 
 ImageCandidate bestFitSourceForSrcsetAttribute(float deviceScaleFactor, unsigned sourceSize, const String& srcsetAttribute);
 
 ImageCandidate bestFitSourceForImageAttributes(float deviceScaleFactor, unsigned sourceSize, const String& srcAttribute, const String& srcsetAttribute);
 
 String bestFitSourceForImageAttributes(float deviceScaleFactor, unsigned sourceSize, const String& srcAttribute, ImageCandidate& srcsetImageCandidate);
 
 }
 
 #endif