Add use counters for Fetch API.

Source/modules/fetch/GlobalFetch.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 "modules/fetch/GlobalFetch.h"
 
 #include "core/dom/ActiveDOMObject.h"
 #include "core/frame/LocalDOMWindow.h"
+#include "core/frame/UseCounter.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "modules/fetch/FetchManager.h"
 #include "modules/fetch/Request.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 #include "wtf/OwnPtr.h"
 
 namespace blink {
 
 namespace {
@@ skipping 73 matching lines @@
     static const char* name() { return "GlobalFetch"; }
 
     OwnPtrWillBeMember<FetchManager> m_fetchManager;
     OwnPtrWillBeMember<StopDetector> m_stopDetector;
 };
 
 } // namespace
 
 ScriptPromise GlobalFetch::fetch(ScriptState* scriptState, DOMWindow& window, const RequestInfo& input, const Dictionary& init, ExceptionState& exceptionState)
 {
+    UseCounter::count(window.executionContext(), UseCounter::Fetch);
     return GlobalFetchImpl<LocalDOMWindow>::from(toLocalDOMWindow(window), window.executionContext()).fetch(scriptState, input, init, exceptionState);
 }
 
 ScriptPromise GlobalFetch::fetch(ScriptState* scriptState, WorkerGlobalScope& worker, const RequestInfo& input, const Dictionary& init, ExceptionState& exceptionState)
 {
+    // Note that UseCounter doesn't work with SharedWorker or ServiceWorker.
+    UseCounter::count(worker.executionContext(), UseCounter::Fetch);
     return GlobalFetchImpl<WorkerGlobalScope>::from(worker, worker.executionContext()).fetch(scriptState, input, init, exceptionState);
 }
 
 } // namespace blink