Make DisplayItem::replay const.

third_party/WebKit/Source/platform/graphics/paint/DrawingDisplayItem.cpp

 // 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.
 
 #include "config.h"
 #include "platform/graphics/paint/DrawingDisplayItem.h"
 
 #include "platform/graphics/GraphicsContext.h"
 #include "public/platform/WebDisplayItemList.h"
 
 #if ENABLE(ASSERT)
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkData.h"
 #include "third_party/skia/include/core/SkStream.h"
 #endif
 
 namespace blink {
 
-void DrawingDisplayItem::replay(GraphicsContext& context)
+void DrawingDisplayItem::replay(GraphicsContext& context) const
 {
     if (m_picture)
         context.drawPicture(m_picture.get());
 }
 
 void DrawingDisplayItem::appendToWebDisplayItemList(WebDisplayItemList* list) const
 {
     if (m_picture)
         list->appendDrawingItem(m_picture.get());
 }
@@ skipping 77 matching lines @@
         return bitmapIsAllZero(bitmap);
     }
     default:
         ASSERT_NOT_REACHED();
     }
     return false;
 }
 #endif // ENABLE(ASSERT)
 
 }