Start implementing ForeignFetchEvent for foreign fetch events.

third_party/WebKit/Source/modules/serviceworkers/ForeignFetchRespondWithObserver.cpp

+// Copyright 2016 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 "modules/serviceworkers/ForeignFetchRespondWithObserver.h"
+
+#include "modules/serviceworkers/ForeignFetchResponse.h"
+
+namespace blink {
+
+ForeignFetchRespondWithObserver* ForeignFetchRespondWithObserver::create(ExecutionContext* context, int eventID, const KURL& requestURL, WebURLRequest::FetchRequestMode requestMode, WebURLRequest::FrameType frameType, WebURLRequest::RequestContext requestContext)
+{
+    return new ForeignFetchRespondWithObserver(context, eventID, requestURL, requestMode, frameType, requestContext);
+}
+
+void ForeignFetchRespondWithObserver::responseWasFulfilled(const ScriptValue& value)
+{
+    ASSERT(getExecutionContext());
+    TrackExceptionState exceptionState;
+    ForeignFetchResponse foreignFetchResponse = ScriptValue::to<ForeignFetchResponse>(toIsolate(getExecutionContext()), value, exceptionState);
+    if (exceptionState.hadException()) {
+        responseWasRejected(WebServiceWorkerResponseErrorNoForeignFetchResponse);
+        return;
+    }
+
+    // TODO(mek): Handle foreign fetch specific response parameters.
+    Response* response = foreignFetchResponse.response();
+    RespondWithObserver::responseWasFulfilled(ScriptValue::from(value.getScriptState(), response));
+}
+
+ForeignFetchRespondWithObserver::ForeignFetchRespondWithObserver(ExecutionContext* context, int eventID, const KURL& requestURL, WebURLRequest::FetchRequestMode requestMode, WebURLRequest::FrameType frameType, WebURLRequest::RequestContext requestContext)
+    : RespondWithObserver(context, eventID, requestURL, requestMode, frameType, requestContext)
+{
+}
+
+} // namespace blink