Plumb CompositedDisplayList to WebViewImpl

Source/core/compositing/DisplayListCompositingBuilder.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 DisplayListCompositingBuilder_h
 #define DisplayListCompositingBuilder_h
 
 #include "core/CoreExport.h"
+#include "platform/graphics/CompositedDisplayList.h"
 #include "platform/graphics/paint/DisplayItemList.h"
-#include "platform/graphics/paint/DisplayItemTransformTree.h"
 
 namespace blink {
 
-struct CompositedDisplayList {
-    // TODO(pdr): Also add our SimpleLayers here.
-    // TODO(pdr): Add the additional property trees (e.g., clip, scroll, etc).
-    OwnPtr<const DisplayItemTransformTree> transformTree;
-};
-
 class CORE_EXPORT DisplayListCompositingBuilder {
 public:
     DisplayListCompositingBuilder(const DisplayItemList& displayItemList, const DisplayListDiff&)
         : m_displayItemList(displayItemList) { }
 
     void build(CompositedDisplayList&);
 
 private:
     const DisplayItemList& m_displayItemList;
 };
 
 } // namespace blink
 
 #endif // DisplayListCompositingBuilder_h