Start implementing ForeignFetchEvent for foreign fetch events.

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

Index: third_party/WebKit/Source/modules/serviceworkers/ForeignFetchRespondWithObserver.h
diff --git a/third_party/WebKit/Source/modules/serviceworkers/ForeignFetchRespondWithObserver.h b/third_party/WebKit/Source/modules/serviceworkers/ForeignFetchRespondWithObserver.h
new file mode 100644
index 0000000000000000000000000000000000000000..f7e61cb34421ba9ae38e999f911989df8492710b
--- /dev/null
+++ b/third_party/WebKit/Source/modules/serviceworkers/ForeignFetchRespondWithObserver.h
@@ -0,0 +1,26 @@
+// 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.
+
+#ifndef ForeignFetchRespondWithObserver_h
+#define ForeignFetchRespondWithObserver_h
+
+#include "modules/serviceworkers/RespondWithObserver.h"
+
+namespace blink {
+
+// This class observes the service worker's handling of a ForeignFetchEvent and
+// notifies the client.
+class MODULES_EXPORT ForeignFetchRespondWithObserver final : public RespondWithObserver {
+public:
+    static ForeignFetchRespondWithObserver* create(ExecutionContext*, int eventID, const KURL& requestURL, WebURLRequest::FetchRequestMode, WebURLRequest::FrameType, WebURLRequest::RequestContext);
+
+    void responseWasFulfilled(const ScriptValue&) override;
+
+private:
+    ForeignFetchRespondWithObserver(ExecutionContext*, int eventID, const KURL& requestURL, WebURLRequest::FetchRequestMode, WebURLRequest::FrameType, WebURLRequest::RequestContext);
+};
+
+} // namespace blink
+
+#endif // ForeignFetchRespondWithObserver_h