Add Frame and RemoteFrame classes.

Source/core/frame/RemoteFrame.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 "core/frame/RemoteFrame.h"
+
+namespace WebCore {
+
+inline RemoteFrame::RemoteFrame(PassRefPtr<FrameInit> frameInit)
+    : Frame(frameInit)
+{
+}
+
+PassRefPtr<RemoteFrame> RemoteFrame::create(PassRefPtr<FrameInit> frameInit)
+{
+    RefPtr<RemoteFrame> frame = adoptRef(new RemoteFrame(frameInit));
+    return frame.release();
+}
+
+RemoteFrame::~RemoteFrame()
+{
+}
+
+} // namespace WebCore