Disable 4 and 8 digit hex CSS colors

third_party/WebKit/Source/platform/graphics/Color.cpp

 /*
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  *
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  * modification, are permitted provided that the following conditions
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  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 #include "platform/graphics/Color.h"
 
 #include "platform/Decimal.h"
+#include "platform/RuntimeEnabledFeatures.h"
 #include "wtf/Assertions.h"
 #include "wtf/HexNumber.h"
 #include "wtf/MathExtras.h"
 #include "wtf/dtoa.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 // VS 2015 and above allow these definitions and in this case require them
 #if !COMPILER(MSVC) || _MSC_VER >= 1900
@@ skipping 75 matching lines @@
     int b = static_cast<int>(nextafter(256, 0) * (colors * (1 - y)));
     return makeRGBA(r, g, b, static_cast<float>(nextafter(256, 0) * a));
 }
 
 // originally moved here from the CSS parser
 template <typename CharacterType>
 static inline bool parseHexColorInternal(const CharacterType* name, unsigned length, RGBA32& rgb)
 {
     if (length != 3 && length != 4 && length != 6 && length != 8)
         return false;
+    if ((length == 8 || length == 4) && !RuntimeEnabledFeatures::cssHexAlphaColorEnabled())
+        return false;
     unsigned value = 0;
     for (unsigned i = 0; i < length; ++i) {
         if (!isASCIIHexDigit(name[i]))
             return false;
         value <<= 4;
         value |= toASCIIHexValue(name[i]);
     }
     if (length == 6) {
         rgb = 0xFF000000 | value;
         return true;
@@ skipping 328 matching lines @@
             (color.green() * alpha  + 254) / 255,
             (color.blue() * alpha  + 254) / 255,
             alpha).rgb();
     } else
          pixelColor = color.rgb();
 
     return pixelColor;
 }
 
 } // namespace blink