Allow interpolation of background-size values with keywords in CSS Animations

third_party/WebKit/Source/core/style/FillLayer.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 19 matching lines @@
 #include "core/style/StyleImage.h"
 #include "platform/Length.h"
 #include "platform/LengthSize.h"
 #include "platform/graphics/GraphicsTypes.h"
 #include "wtf/Allocator.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 struct FillSize {
-    STACK_ALLOCATED();
+    DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();

[suzyh_UTC10 (ex-contributor), 2016/08/26 04:14:34]

Can you elaborate on the consequences of making this change?

[alancutter (OOO until 2018), 2016/08/26 13:31:48]

It's necessary for Vector<FillSize> which does placement new.

     FillSize()
         : type(SizeLength)
     {
     }
 
     FillSize(EFillSizeType t, const LengthSize& l)
         : type(t)
         , size(l)
     {
     }
@@ skipping 202 matching lines @@
 
     mutable unsigned m_thisOrNextLayersClipMax : 2; // EFillBox, maximum m_clip value from this to bottom layer
     mutable unsigned m_thisOrNextLayersUseContentBox : 1; // True if any of this or subsequent layers has content-box clip or origin.
     mutable unsigned m_thisOrNextLayersHaveLocalAttachment : 1; // True if any of this or subsequent layers has local attachment.
     mutable unsigned m_cachedPropertiesComputed : 1; // Set once any of the above is accessed. The layers will be frozen thereafter.
 };
 
 } // namespace blink
 
 #endif // FillLayer_h