Optimize CompositingRecorder::endCompositing to not need an SkPictureBuilder

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"
@@ skipping 34 matching lines @@
     m_knownToBeOpaque = true;
   }
 
  private:
   GraphicsContext& m_context;
   const DisplayItemClient& m_displayItemClient;
   const DisplayItem::Type m_displayItemType;
 
   // True if there are no transparent areas. Only used for SlimmingPaintV2.
   bool m_knownToBeOpaque;
-
-#if DCHECK_IS_ON()
-  size_t m_displayItemPosition;
-#endif
 };
 
 }  // namespace blink
 
 #endif  // DrawingRecorder_h