Make DisplayItem::replay const.

third_party/WebKit/Source/platform/graphics/paint/TransformDisplayItem.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/TransformDisplayItem.h"
 
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/transforms/AffineTransform.h"
 #include "public/platform/WebDisplayItemList.h"
 
 namespace blink {
 
-void BeginTransformDisplayItem::replay(GraphicsContext& context)
+void BeginTransformDisplayItem::replay(GraphicsContext& context) const
 {
     context.save();
     context.concatCTM(m_transform);
 }
 
 void BeginTransformDisplayItem::appendToWebDisplayItemList(WebDisplayItemList* list) const
 {
     list->appendTransformItem(affineTransformToSkMatrix(m_transform));
 }
 
 #ifndef NDEBUG
 void BeginTransformDisplayItem::dumpPropertiesAsDebugString(WTF::StringBuilder& stringBuilder) const
 {
     PairedBeginDisplayItem::dumpPropertiesAsDebugString(stringBuilder);
     stringBuilder.append(WTF::String::format(", transform: [%lf,%lf,%lf,%lf,%lf,%lf]",
         m_transform.a(), m_transform.b(), m_transform.c(), m_transform.d(), m_transform.e(), m_transform.f()));
 }
 #endif
 
-void EndTransformDisplayItem::replay(GraphicsContext& context)
+void EndTransformDisplayItem::replay(GraphicsContext& context) const
 {
     context.restore();
 }
 
 void EndTransformDisplayItem::appendToWebDisplayItemList(WebDisplayItemList* list) const
 {
     list->appendEndTransformItem();
 }
 
 } // namespace blink