Add Client Attribute to FetchEvent- Blink Side.

public/platform/WebServiceWorkerRequest.h

Index: public/platform/WebServiceWorkerRequest.h
diff --git a/public/platform/WebServiceWorkerRequest.h b/public/platform/WebServiceWorkerRequest.h
index 45b04519fd901ad3b09ef93242d8ac93d19e1b89..41d44f2ed8b13be9d3257e05f90ee946c19c81a2 100644
--- a/public/platform/WebServiceWorkerRequest.h
+++ b/public/platform/WebServiceWorkerRequest.h
@@ -8,6 +8,7 @@
 #include "WebCommon.h"
 #include "public/platform/WebPrivatePtr.h"
 #include "public/platform/WebReferrerPolicy.h"
+#include "public/platform/WebServiceWorkerClientsInfo.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebURL.h"
 #include "public/platform/WebURLRequest.h"
@@ -76,6 +77,9 @@ public:
     void setIsReload(bool);
     bool isReload() const;
 
+    void setClient(const WebServiceWorkerClientInfo&);
+    WebServiceWorkerClientInfo& client() const;
+
 #if INSIDE_BLINK
     const HTTPHeaderMap& headers() const;
     PassRefPtr<BlobDataHandle> blobDataHandle() const;