[Streams] Add "useStreamOnResponse" on WebURLRequest.

public/platform/WebURLRequest.h

Index: public/platform/WebURLRequest.h
diff --git a/public/platform/WebURLRequest.h b/public/platform/WebURLRequest.h
index 9dbae0ab21622999c7e9f0de3ed7aa1545897ff5..17cc9cc0fc27d9d5aa6902509377aad23ac9d0a8 100644
--- a/public/platform/WebURLRequest.h
+++ b/public/platform/WebURLRequest.h
@@ -224,6 +224,10 @@ public:
     BLINK_PLATFORM_EXPORT bool downloadToFile() const;
     BLINK_PLATFORM_EXPORT void setDownloadToFile(bool);
 
+    // True if the requestor wants to receive the response body as a stream.
+    BLINK_PLATFORM_EXPORT bool useStreamOnResponse() const;
+    BLINK_PLATFORM_EXPORT void setUseStreamOnResponse(bool);
+
     // True if the request should not be handled by the ServiceWorker.
     BLINK_PLATFORM_EXPORT bool skipServiceWorker() const;
     BLINK_PLATFORM_EXPORT void setSkipServiceWorker(bool);