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

third_party/WebKit/Source/core/css/CSSValue.cpp

 /*
  * Copyright (C) 2011 Andreas Kling (kling@webkit.org)
  *
  * 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 51 matching lines @@
 #include "core/css/CSSUnicodeRangeValue.h"
 #include "core/css/CSSUnsetValue.h"
 #include "core/css/CSSValueList.h"
 #include "core/css/CSSValuePair.h"
 #include "core/css/CSSVariableReferenceValue.h"
 #include "platform/Length.h"
 #include "wtf/SizeAssertions.h"
 
 namespace blink {
 
+using namespace cssvalue;
+
 struct SameSizeAsCSSValue
     : public GarbageCollectedFinalized<SameSizeAsCSSValue> {
   uint32_t bitfields;
 };
 ASSERT_SIZE(CSSValue, SameSizeAsCSSValue);
 
 CSSValue* CSSValue::create(const Length& value, float zoom) {
   switch (value.type()) {
     case Auto:
     case MinContent:
@@ skipping 524 matching lines @@
       toCSSCustomPropertyDeclaration(this)->traceAfterDispatch(visitor);
       return;
     case PendingSubstitutionValueClass:
       toCSSPendingSubstitutionValue(this)->traceAfterDispatch(visitor);
       return;
   }
   NOTREACHED();
 }
 
 }  // namespace blink