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..9a4f19d6b60748dfa0986e9ce70d37bdcaa1363c 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 original URL of the first response. If the response is generated in a
+  // Service Worker this URL is empty. BufferedDataSource checks the original
+  // URL of each successive response. If it is different from the original URL
+  // of the 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.