Picture element initial implementation

Source/core/html/parser/HTMLResourcePreloader.cpp

 /*
  * 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 61 matching lines @@
 
 static bool mediaAttributeMatches(Frame* frame, RenderStyle* renderStyle, const String& attributeValue)
 {
     RefPtr<MediaQuerySet> mediaQueries = MediaQuerySet::createAllowingDescriptionSyntax(attributeValue);
     MediaQueryEvaluator mediaQueryEvaluator("screen", frame, renderStyle);
     return mediaQueryEvaluator.eval(mediaQueries.get());
 }
 
 void HTMLResourcePreloader::preload(PassOwnPtr<PreloadRequest> preload)
 {
+    if (preload->bundleStart()) {
+        m_inBundle = true;
+        return;
+    }
+    if (preload->bundleEnd()) {
+        m_inBundle = false;
+        m_foundBundleResource = false;
+        return;
+    }
     ASSERT(m_document->frame());
     ASSERT(m_document->renderer());
     ASSERT(m_document->renderer()->style());
     if (!preload->media().isEmpty() && !mediaAttributeMatches(m_document->frame(), m_document->renderer()->style(), preload->media()))
         return;
 
+    if (m_inBundle && m_foundBundleResource)
+        return;
+
+    m_foundBundleResource = true;
+
     CachedResourceRequest request = preload->resourceRequest(m_document);
     m_document->cachedResourceLoader()->preload(preload->resourceType(), request, preload->charset());
 }
 
 
 }