Check the response URL origin in BufferedDataSource to avoid mixing cross-origin responses.

media/blink/buffered_data_source.h

Index: media/blink/buffered_data_source.h
diff --git a/media/blink/buffered_data_source.h b/media/blink/buffered_data_source.h
index 32f14816fcdce5a3307fb8a898c965d67f2b2c7d..766fc9854eaaa864625fff9704882c1b93c35585 100644
--- a/media/blink/buffered_data_source.h
+++ b/media/blink/buffered_data_source.h
@@ -238,6 +238,12 @@ class MEDIA_EXPORT BufferedDataSource : public DataSource {
 
   DownloadingCB downloading_cb_;
 
+  // The orinal URL of the first response. If the response is generated in the
+  // Service Worker this URL is empty. BufferedDataSource checks the orinal URL

[falken, 2015/07/02 01:04:08]

"original URL" (2 places)
"a Service Worker"

[horo, 2015/07/02 03:10:49]

Done.

+  // of the succeeding response. If it is different from the original URL of the

[falken, 2015/07/02 01:04:08]

"of each successive response"?

[horo, 2015/07/02 03:10:49]

Done.

+  // first response, it is treated as an error.
+  GURL response_original_url_;
+
   // Disallow rebinding WeakReference ownership to a different thread by keeping
   // a persistent reference. This avoids problems with the thread-safety of
   // reaching into this class from multiple threads to attain a WeakPtr.