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

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

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc.
  * All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 54 matching lines @@
 #include "core/style/ContentData.h"
 #include "core/style/CursorData.h"
 #include "core/style/QuotesData.h"
 #include "core/style/ShadowList.h"
 #include "core/style/StyleInheritedVariables.h"
 #include "core/style/StyleNonInheritedVariables.h"
 #include "platform/LengthFunctions.h"
 
 namespace blink {
 
+using namespace cssvalue;
+
 inline static bool isFlexOrGrid(const ComputedStyle* style) {
   return style && style->isDisplayFlexibleOrGridBox();
 }
 
 inline static CSSPrimitiveValue* zoomAdjustedPixelValue(
     double value,
     const ComputedStyle& style) {
   return CSSPrimitiveValue::create(adjustFloatForAbsoluteZoom(value, style),
                                    CSSPrimitiveValue::UnitType::Pixels);
 }
@@ skipping 3607 matching lines @@
     case CSSPropertyAll:
       return nullptr;
     default:
       break;
   }
   NOTREACHED();
   return nullptr;
 }
 
 }  // namespace blink