Introduce the nested namespace ::blink::cssvalue, start with CSSColorValue.

third_party/WebKit/Source/core/css/CSSValuePool.h

 /*
  * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 33 matching lines @@
 
 namespace blink {
 
 class CORE_EXPORT CSSValuePool
     : public GarbageCollectedFinalized<CSSValuePool> {
   WTF_MAKE_NONCOPYABLE(CSSValuePool);
 
  public:
   // TODO(sashab): Make all the value pools store const CSSValues.
   static const int maximumCacheableIntegerValue = 255;
+  using CSSColorValue = ::blink::cssvalue::CSSColorValue;

[dcheng, 2017/04/05 06:21:26]

Nit: I think ::blink:: can be omitted.

(We don't have a lot of examples of using nested namespaces, but I did a quick
search of how blink::protocol is referenced, and minimal qualification seems to
be preferred over full qualification)

[slangley, 2017/04/05 06:45:57]

Done

   using ColorValueCache = HeapHashMap<unsigned, Member<CSSColorValue>>;
   static const unsigned maximumColorCacheSize = 512;
   using FontFaceValueCache =
       HeapHashMap<AtomicString, Member<const CSSValueList>>;
   static const unsigned maximumFontFaceCacheSize = 128;
   using FontFamilyValueCache = HeapHashMap<String, Member<CSSFontFamilyValue>>;
 
   // Cached individual values.
   CSSColorValue* transparentColor() { return m_colorTransparent; }
   CSSColorValue* whiteColor() { return m_colorWhite; }
@@ skipping 80 matching lines @@
   FontFamilyValueCache m_fontFamilyValueCache;
 
   friend CORE_EXPORT CSSValuePool& cssValuePool();
 };
 
 CORE_EXPORT CSSValuePool& cssValuePool();
 
 }  // namespace blink
 
 #endif