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

third_party/WebKit/Source/core/css/parser/CSSParserFastPathsTest.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/CSSParserFastPaths.h"
 
 #include "core/css/CSSColorValue.h"
 #include "core/css/CSSIdentifierValue.h"
 #include "core/css/CSSValueList.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
+using namespace cssvalue;
+
 TEST(CSSParserFastPathsTest, ParseKeyword) {
   CSSValue* value = CSSParserFastPaths::maybeParseValue(
       CSSPropertyFloat, "left", HTMLStandardMode);
   ASSERT_NE(nullptr, value);
   EXPECT_TRUE(value->isIdentifierValue());
   CSSIdentifierValue* identifierValue = toCSSIdentifierValue(value);
   EXPECT_EQ(CSSValueLeft, identifierValue->getValueID());
   value = CSSParserFastPaths::maybeParseValue(CSSPropertyFloat, "foo",
                                               HTMLStandardMode);
   ASSERT_EQ(nullptr, value);
@@ skipping 77 matching lines @@
 
 TEST(CSSParserFastPathsTest, ParseColorWithLargeAlpha) {
   CSSValue* value = CSSParserFastPaths::parseColor("rgba(0,0,0,1893205797.13)",
                                                    HTMLStandardMode);
   EXPECT_NE(nullptr, value);
   EXPECT_TRUE(value->isColorValue());
   EXPECT_EQ(Color::black, toCSSColorValue(*value).value());
 }
 
 }  // namespace blink