Move isColorKeyword out of CSSPropertyParser

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

 // Copyright 2015 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/StyleColor.h"
 
 #include "core/layout/LayoutTheme.h"
 
 namespace blink {
 
 Color StyleColor::colorFromKeyword(CSSValueID keyword)
 {
     if (const char* valueName = getValueName(keyword)) {
         if (const NamedColor* namedColor = findColor(valueName, strlen(valueName)))
             return Color(namedColor->ARGBValue);
     }
     return LayoutTheme::theme().systemColor(keyword);
 }
 
+bool StyleColor::isColorKeyword(CSSValueID id)
+{
+    // Named colors and color keywords:
+    //
+    // <named-color>
+    //   'aqua', 'black', 'blue', ..., 'yellow' (CSS3: "basic color keywords")
+    //   'aliceblue', ..., 'yellowgreen'        (CSS3: "extended color keywords")
+    //   'transparent'
+    //
+    // 'currentcolor'
+    //
+    // <deprecated-system-color>
+    //   'ActiveBorder', ..., 'WindowText'
+    //
+    // WebKit proprietary/internal:
+    //   '-webkit-link'
+    //   '-webkit-activelink'
+    //   '-internal-active-list-box-selection'
+    //   '-internal-active-list-box-selection-text'
+    //   '-internal-inactive-list-box-selection'
+    //   '-internal-inactive-list-box-selection-text'
+    //   '-webkit-focus-ring-color'
+    //   '-internal-quirk-inherit'
+    //
+    return (id >= CSSValueAqua && id <= CSSValueInternalQuirkInherit)
+        || (id >= CSSValueAliceblue && id <= CSSValueYellowgreen)
+        || id == CSSValueMenu;
+}
+
 } // namespace blink