Show media and VTT text tracks in the devtools.

Source/core/loader/DocumentThreadableLoader.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013, Intel Corporation
  *
  * 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.
@@ skipping 379 matching lines @@
         if (m_actualRequest) {
             options.sniffContent = DoNotSniffContent;
             options.dataBufferingPolicy = BufferData;
         }
 
         if (m_options.timeoutMilliseconds > 0)
             m_timeoutTimer.startOneShot(m_options.timeoutMilliseconds / 1000.0);
 
         FetchRequest newRequest(request, m_options.initiator, options);
         ASSERT(!resource());
-        setResource(m_document->fetcher()->fetchRawResource(newRequest));
+        if (request.targetType() == ResourceRequest::TargetIsMedia)
+            setResource(m_document->fetcher()->fetchMedia(newRequest));
+        else
+            setResource(m_document->fetcher()->fetchRawResource(newRequest));
         if (resource() && resource()->loader()) {
             unsigned long identifier = resource()->identifier();
             InspectorInstrumentation::documentThreadableLoaderStartedLoadingForClient(m_document, identifier, m_client);
         }
         return;
     }
 
     FetchRequest fetchRequest(request, m_options.initiator, options);
     ResourcePtr<Resource> resource = m_document->fetcher()->fetchSynchronously(fetchRequest);
     ResourceResponse response = resource ? resource->response() : ResourceResponse();
@@ skipping 60 matching lines @@
 
     if (!(requestUrl.user().isEmpty() && requestUrl.pass().isEmpty())) {
         errorDescription = "The request was redirected to a URL ('" + requestUrl.string() + "') containing userinfo, which is disallowed for cross-origin requests.";
         return false;
     }
 
     return true;
 }
 
 } // namespace WebCore