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

third_party/WebKit/Source/core/css/parser/CSSPropertyParserHelpers.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/parser/CSSPropertyParserHelpers.h"
 
 #include "core/css/CSSCalculationValue.h"
 #include "core/css/CSSColorValue.h"
 #include "core/css/CSSCrossfadeValue.h"
 #include "core/css/CSSGradientValue.h"
 #include "core/css/CSSImageSetValue.h"
 #include "core/css/CSSImageValue.h"
 #include "core/css/CSSPaintValue.h"
 #include "core/css/CSSStringValue.h"
 #include "core/css/CSSURIValue.h"
 #include "core/css/CSSValuePair.h"
 #include "core/css/CSSVariableData.h"
 #include "core/css/StyleColor.h"
 #include "core/css/parser/CSSParserContext.h"
 #include "core/frame/UseCounter.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
 namespace blink {
 
+using namespace cssvalue;
+
 namespace CSSPropertyParserHelpers {
 
 namespace {
 
 // Add CSSVariableData to variableData vector.
 bool addCSSPaintArgument(const Vector<CSSParserToken>& tokens,
                          Vector<RefPtr<CSSVariableData>>* const variableData) {
   CSSParserTokenRange tokenRange(tokens);
   if (!tokenRange.atEnd()) {
     RefPtr<CSSVariableData> unparsedCSSVariableData =
@@ skipping 1370 matching lines @@
 
 // https://drafts.csswg.org/css-shapes-1/#typedef-shape-box
 CSSIdentifierValue* consumeShapeBox(CSSParserTokenRange& range) {
   return consumeIdent<CSSValueContentBox, CSSValuePaddingBox, CSSValueBorderBox,
                       CSSValueMarginBox>(range);
 }
 
 }  // namespace CSSPropertyParserHelpers
 
 }  // namespace blink