Add encoded_data_length argument to didDownloadData delegate method

public/platform/WebURLLoaderClient.h

 /*
  * 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 37 matching lines @@
     // Called to report upload progress. The bytes reported correspond to
     // the HTTP message body.
     virtual void didSendData(
         WebURLLoader*, unsigned long long bytesSent, unsigned long long totalBytesToBeSent) { }
 
     // Called when response headers are received.
     virtual void didReceiveResponse(WebURLLoader*, const WebURLResponse&) { }
 
     // Called when a chunk of response data is downloaded. This is only called
     // if WebURLRequest's downloadToFile flag was set to true.
-    virtual void didDownloadData(WebURLLoader*, int dataLength) { }
+    virtual void didDownloadData(WebURLLoader*, int dataLength, int encodedDataLength) { }
+    // FIXME: Remove this stub function when Chrome-side change propagating the
+    // encodedDataLength is landed.
+    virtual void didDownloadData(WebURLLoader* loader, int dataLength) { didDownloadData(loader, dataLength, -1); }
 
     // Called when a chunk of response data is received.
     virtual void didReceiveData(WebURLLoader*, const char* data, int dataLength, int encodedDataLength) { }
 
     // Called when a chunk of renderer-generated metadata is received from the cache.
     virtual void didReceiveCachedMetadata(WebURLLoader*, const char* data, int dataLength) { }
 
     // Called when the load completes successfully.
     virtual void didFinishLoading(WebURLLoader*, double finishTime) { }
 
     // Called when the load completes with an error.
     virtual void didFail(WebURLLoader*, const WebURLError&) { }
 
 protected:
     virtual ~WebURLLoaderClient() { }
 };
 
 } // namespace WebKit
 
 #endif