Make DisplayItemClient an interface

third_party/WebKit/Source/platform/graphics/paint/DrawingRecorder.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 DrawingRecorder_h
 #define DrawingRecorder_h
 
 #include "platform/PlatformExport.h"
 
 #include "platform/geometry/FloatRect.h"
 #include "platform/graphics/paint/DrawingDisplayItem.h"
 #include "wtf/Allocator.h"
 #include "wtf/Noncopyable.h"
 
 #ifndef NDEBUG
 #include "wtf/text/WTFString.h"
 #endif
 
 namespace blink {
 
 class GraphicsContext;
 
 class PLATFORM_EXPORT DrawingRecorder final {
     DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
     WTF_MAKE_NONCOPYABLE(DrawingRecorder);
 public:
-    static bool useCachedDrawingIfPossible(GraphicsContext&, const DisplayItemClientWrapper&, DisplayItem::Type);
+    static bool useCachedDrawingIfPossible(GraphicsContext&, const DisplayItemClient&, DisplayItem::Type);
 
-    DrawingRecorder(GraphicsContext&, const DisplayItemClientWrapper&, DisplayItem::Type, const FloatRect& cullRect);
+    DrawingRecorder(GraphicsContext&, const DisplayItemClient&, DisplayItem::Type, const FloatRect& cullRect);
     ~DrawingRecorder();
 
 #if ENABLE(ASSERT)
     void setUnderInvalidationCheckingMode(DrawingDisplayItem::UnderInvalidationCheckingMode mode) { m_underInvalidationCheckingMode = mode; }
 #endif
 
 private:
     GraphicsContext& m_context;
-    DisplayItemClientWrapper m_displayItemClient;
+    const DisplayItemClient& m_displayItemClient;
     const DisplayItem::Type m_displayItemType;
 #if ENABLE(ASSERT)
     size_t m_displayItemPosition;
     DrawingDisplayItem::UnderInvalidationCheckingMode m_underInvalidationCheckingMode;
 #endif
 };
 
 } // namespace blink
 
 #endif // DrawingRecorder_h