Plumb CompositedDisplayList to WebViewImpl

public/platform/WebCompositedDisplayList.h

+// Copyright 2015 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 WebCompositedDisplayList_h
+#define WebCompositedDisplayList_h
+
+#include "public/platform/WebCommon.h"
+#include "public/platform/WebPrivateOwnPtr.h"
+
+namespace blink {
+
+class CompositedDisplayList;
+
+class BLINK_PLATFORM_EXPORT WebCompositedDisplayList {
+public:
+    WebCompositedDisplayList() {}
+    ~WebCompositedDisplayList();
+
+#if INSIDE_BLINK
+    void assign(WTF::PassOwnPtr<CompositedDisplayList>);
+    CompositedDisplayList* compositedDisplayListForTesting();
+#endif
+
+    // TODO(pdr): Add accessor functions for the data in m_private as needed.
+
+private:
+    WebPrivateOwnPtr<CompositedDisplayList> m_private;
+};
+
+} // namespace blink
+
+#endif // WebCompositedDisplayList_h