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 26 matching lines @@
 #include "core/css/CSSInitialValue.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/CSSUnsetValue.h"
 #include "core/css/CSSValueList.h"
 #include "wtf/HashMap.h"
 #include "wtf/RefPtr.h"
 #include "wtf/text/AtomicStringHash.h"
 
 namespace blink {
 
+using ::blink::cssvalue::CSSColorValue;

[dcheng, 2017/04/05 02:31:34]

It would be nicer not to have using declarations in headers (this is against the
Google C++ style guide)

[slangley, 2017/04/05 04:40:18]

done

+
 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 ColorValueCache = HeapHashMap<unsigned, Member<CSSColorValue>>;
   static const unsigned maximumColorCacheSize = 512;
   using FontFaceValueCache =
@@ skipping 87 matching lines @@
   FontFamilyValueCache m_fontFamilyValueCache;
 
   friend CORE_EXPORT CSSValuePool& cssValuePool();
 };
 
 CORE_EXPORT CSSValuePool& cssValuePool();
 
 }  // namespace blink
 
 #endif