Add Client Attribute to FetchEvent- Blink Side.

Source/modules/serviceworkers/FetchEvent.cpp

 // 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.
 
 #include "config.h"
 #include "FetchEvent.h"
 
 #include "modules/fetch/Request.h"
 #include "modules/serviceworkers/ServiceWorkerGlobalScope.h"
 #include "wtf/RefPtr.h"
@@ skipping 20 matching lines @@
 Request* FetchEvent::request() const
 {
     return m_request;
 }
 
 bool FetchEvent::isReload() const
 {
     return m_isReload;
 }
 
+ServiceWorkerClient* FetchEvent::client() const
+{
+    return m_client;
+}
+
 void FetchEvent::respondWith(ScriptState* scriptState, const ScriptValue& value, ExceptionState& exceptionState)
 {
     stopImmediatePropagation();
     m_observer->respondWith(scriptState, value, exceptionState);
 }
 
 const AtomicString& FetchEvent::interfaceName() const
 {
     return EventNames::FetchEvent;
 }
 
 FetchEvent::FetchEvent()
     : m_isReload(false)
 {
 }
 
 FetchEvent::FetchEvent(const AtomicString& type, const FetchEventInit& initializer, RespondWithObserver* observer)
     : ExtendableEvent(type, initializer)
     , m_observer(observer)
 {
     if (initializer.hasRequest())
         m_request = initializer.request();
+    if (initializer.hasClient())
+        m_client = initializer.client();
     m_isReload = initializer.isReload();
 }
 
 DEFINE_TRACE(FetchEvent)
 {
     visitor->trace(m_request);
     visitor->trace(m_observer);
     ExtendableEvent::trace(visitor);
 }
 
 } // namespace blink