[CSS] Accept 8 (#RRGGBBAA) and 4 (#RGBA) value hex colors

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

 // Copyright 2014 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/StylePropertyShorthand.h"
 #include "core/css/CSSFunctionValue.h"
 #include "core/css/CSSValuePool.h"
 #include "core/css/parser/CSSParserIdioms.h"
@@ skipping 369 matching lines @@
 }
 
 template <typename CharacterType>
 static bool fastParseColorInternal(RGBA32& rgb, const CharacterType* characters, unsigned length, bool quirksMode)
 {
     CSSPrimitiveValue::UnitType expect = CSSPrimitiveValue::UnitType::Unknown;
 
     if (length >= 4 && characters[0] == '#')
         return Color::parseHexColor(characters + 1, length - 1, rgb);
 
-    if (quirksMode && length >= 3) {
+    if (quirksMode && (length == 3 || length == 6)) {
         if (Color::parseHexColor(characters, length, rgb))
             return true;
     }
 
     // Try rgba() syntax.
     if (mightBeRGBA(characters, length)) {
         const CharacterType* current = characters + 5;
         const CharacterType* end = characters + length;
         int red;
         int green;
@@ skipping 629 matching lines @@
     if (isColorPropertyID(propertyID))
         return parseColor(string, parserMode);
     if (CSSValue* keyword = parseKeywordValue(propertyID, string, parserMode))
         return keyword;
     if (CSSValue* transform = parseSimpleTransform(propertyID, string))
         return transform;
     return nullptr;
 }
 
 } // namespace blink