Let the client (browser) set blobs in WebServiceWorkerResponse.

Source/platform/exported/WebServiceWorkerResponse.cpp

Index: Source/platform/exported/WebServiceWorkerResponse.cpp
diff --git a/Source/platform/exported/WebServiceWorkerResponse.cpp b/Source/platform/exported/WebServiceWorkerResponse.cpp
index ddf9f9b8312e87d7dbf67303a894570c8efc7fa6..f01a271492fc5bd9318a39f8ca94865315b38fb8 100644
--- a/Source/platform/exported/WebServiceWorkerResponse.cpp
+++ b/Source/platform/exported/WebServiceWorkerResponse.cpp
@@ -114,6 +114,11 @@ void WebServiceWorkerResponse::visitHTTPHeaderFields(WebHTTPHeaderVisitor* heade
         headerVisitor->visitHeader(i->key, i->value);
 }
 
+void WebServiceWorkerResponse::setBlob(const WebString& uuid, uint64_t size)
+{
+    m_private->blobDataHandle = BlobDataHandle::create(uuid, String(), size);
+}
+
 WebString WebServiceWorkerResponse::blobUUID() const
 {
     if (!m_private->blobDataHandle)
@@ -121,6 +126,13 @@ WebString WebServiceWorkerResponse::blobUUID() const
     return m_private->blobDataHandle->uuid();
 }
 
+uint64_t WebServiceWorkerResponse::blobSize() const
+{
+    if (!m_private->blobDataHandle)
+        return 0;
+    return m_private->blobDataHandle->size();
+}
+
 const HTTPHeaderMap& WebServiceWorkerResponse::headers() const
 {
     return m_private->headers;