Let the client (browser) set blobs in WebServiceWorkerResponse.

public/platform/WebServiceWorkerResponse.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebServiceWorkerResponse_h
 #define WebServiceWorkerResponse_h
 
 #include "WebCommon.h"
 #include "public/platform/WebPrivatePtr.h"
 #include "public/platform/WebServiceWorkerResponseType.h"
@@ skipping 46 matching lines @@
     void setHeader(const WebString& key, const WebString& value);
 
     // If the key already exists, appends the value to the same key (comma
     // delimited) else creates a new entry.
     void appendHeader(const WebString& key, const WebString& value);
 
     WebVector<WebString> getHeaderKeys() const;
     WebString getHeader(const WebString& key) const;
     void visitHTTPHeaderFields(WebHTTPHeaderVisitor*) const;
 
+    void setBlob(const WebString& uuid, uint64_t size);
     WebString blobUUID() const;
+    uint64_t blobSize() const;
 
 #if INSIDE_BLINK
     const HTTPHeaderMap& headers() const;
 
     void setBlobDataHandle(PassRefPtr<BlobDataHandle>);
     PassRefPtr<BlobDataHandle> blobDataHandle() const;
 #endif
 
 private:
     WebPrivatePtr<WebServiceWorkerResponsePrivate> m_private;
 };
 
 } // namespace blink
 
 #endif // WebServiceWorkerResponse_h