Add more plumbing for FetchEvent including WebServiceWorkerResponse

Source/modules/serviceworkers/Response.h

Index: Source/modules/serviceworkers/Response.h
diff --git a/Source/modules/serviceworkers/Response.h b/Source/modules/serviceworkers/Response.h
index 10691b17bdd0a5f0a628bd7e3f0589c815cfabec..0b093b6185e7f1e5f377f5d757908fd32d6cd830 100644
--- a/Source/modules/serviceworkers/Response.h
+++ b/Source/modules/serviceworkers/Response.h
@@ -10,6 +10,8 @@
 #include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
+namespace blink { class WebServiceWorkerResponse; }
+
 namespace WebCore {
 
 struct ResponseInit;
@@ -32,6 +34,8 @@ public:
     Dictionary* headers();
     void headers(const Dictionary&);
 
+    void populateWebServiceWorkerResponse(blink::WebServiceWorkerResponse&);
+
 private:
     explicit Response(const ResponseInit&);
     unsigned short m_statusCode;