Make DisplayItemClient an interface

third_party/WebKit/Source/core/paint/TransformRecorder.h

 // 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.
 
 #ifndef TransformRecorder_h
 #define TransformRecorder_h
 
 #include "core/CoreExport.h"
 #include "platform/graphics/paint/DisplayItem.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class GraphicsContext;
 class AffineTransform;
 
 class CORE_EXPORT TransformRecorder {
     STACK_ALLOCATED();
 public:
-    TransformRecorder(GraphicsContext&, const DisplayItemClientWrapper&, const AffineTransform&);
+    TransformRecorder(GraphicsContext&, const DisplayItemClient&, const AffineTransform&);
     ~TransformRecorder();
 
 private:
     GraphicsContext& m_context;
-    DisplayItemClientWrapper m_client;
+    const DisplayItemClient& m_client;
     bool m_skipRecordingForIdentityTransform;
 };
 
 } // namespace blink
 
 #endif // TransformRecorder_h