Plumb CompositedDisplayList to WebViewImpl

Source/core/compositing/DisplayListCompositingBuilder.h

Index: Source/core/compositing/DisplayListCompositingBuilder.h
diff --git a/Source/core/compositing/DisplayListCompositingBuilder.h b/Source/core/compositing/DisplayListCompositingBuilder.h
index 765763f5dd2cf64076943bbfe62dd31225e90d8d..dd2317fe302111e46c2f19cc5ebe084b75836e50 100644
--- a/Source/core/compositing/DisplayListCompositingBuilder.h
+++ b/Source/core/compositing/DisplayListCompositingBuilder.h
@@ -6,17 +6,11 @@
 #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&)