[ServiceWorker] Add WebServiceWorkerRequest::setBlob() to support body of FetchEvent

public/platform/WebServiceWorkerRequest.h

Index: public/platform/WebServiceWorkerRequest.h
diff --git a/public/platform/WebServiceWorkerRequest.h b/public/platform/WebServiceWorkerRequest.h
index 85aef2ef1d7f1de314e40e7f615793e52271020d..8c0b219b24a2c8b18478107029da1e338948e6b6 100644
--- a/public/platform/WebServiceWorkerRequest.h
+++ b/public/platform/WebServiceWorkerRequest.h
@@ -21,6 +21,7 @@
 
 namespace blink {
 
+class BlobDataHandle;
 class WebServiceWorkerRequestPrivate;
 
 // Represents a request of a fetch operation. FetchEvent dispatched by the
@@ -47,6 +48,8 @@ public:
 
     void setHeader(const WebString& key, const WebString& value);
 
+    void setBlob(const WebString& uuid, long long size);
+
     void setReferrer(const WebString&, WebReferrerPolicy);
 
     void setIsReload(bool);
@@ -54,6 +57,7 @@ public:
 
 #if INSIDE_BLINK
     const HTTPHeaderMap& headers() const;
+    PassRefPtr<BlobDataHandle> blobDataHandle() const;
     const Referrer& referrer() const;
 #endif