Plumb CompositedDisplayList to WebViewImpl

Source/platform/graphics/CompositedDisplayList.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
+#ifndef CompositedDisplayList_h
+#define CompositedDisplayList_h
 
-#include "core/CoreExport.h"
 #include "platform/graphics/paint/DisplayItemList.h"
 #include "platform/graphics/paint/DisplayItemTransformTree.h"
 
 namespace blink {
 
-struct CompositedDisplayList {
+// The result of running the simple layer compositing algorithm. See:
+// https://docs.google.com/document/d/1qF7wpO_lhuxUO6YXKZ3CJuXi0grcb5gKZJBBgnoTd0k/view
+class CompositedDisplayList {
+public:
     // 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
+#endif // CompositedDisplayList_h