[Streams] Add "useStreamOnResponse" on WebURLRequest.

public/platform/WebURLRequest.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 210 matching lines @@
 
     // If true, the response body will be downloaded to a file managed by the
     // WebURLLoader. See WebURLResponse::downloadedFilePath.
     BLINK_PLATFORM_EXPORT bool downloadToFile() const;
     BLINK_PLATFORM_EXPORT void setDownloadToFile(bool);
 
     // True if the request should not be handled by the ServiceWorker.
     BLINK_PLATFORM_EXPORT bool skipServiceWorker() const;
     BLINK_PLATFORM_EXPORT void setSkipServiceWorker(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);
+
     // The request mode which will be passed to the ServiceWorker.
     BLINK_PLATFORM_EXPORT FetchRequestMode fetchRequestMode() const;
     BLINK_PLATFORM_EXPORT void setFetchRequestMode(FetchRequestMode);
 
     // The credentials mode which will be passed to the ServiceWorker.
     BLINK_PLATFORM_EXPORT FetchCredentialsMode fetchCredentialsMode() const;
     BLINK_PLATFORM_EXPORT void setFetchCredentialsMode(FetchCredentialsMode);
 
     // Extra data associated with the underlying resource request. Resource
     // requests can be copied. If non-null, each copy of a resource requests
@@ skipping 15 matching lines @@
 protected:
     BLINK_PLATFORM_EXPORT void assign(WebURLRequestPrivate*);
 
 private:
     WebURLRequestPrivate* m_private;
 };
 
 } // namespace blink
 
 #endif