Changed type of border-width longhands from unsigned to float.

third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 130 matching lines @@
         return 5;
     if (valueID == CSSValueInvalid) {
         // FIXME: We are moving to use the full page zoom implementation to handle high-dpi.
         // In that case specyfing a border-width of less than 1px would result in a border that is one device pixel thick.
         // With this change that would instead be rounded up to 2 device pixels.
         // Consider clamping it to device pixels or zoom adjusted CSS pixels instead of raw CSS pixels.
         // Reference crbug.com/485650 and crbug.com/382483
         double result = primitiveValue.computeLength<double>(state.cssToLengthConversionData());
         if (result > 0.0 && result < 1.0)
             return 1.0;
-        return clampTo<T>(roundForImpreciseConversion<T>(result), defaultMinimumForClamp<T>(), defaultMaximumForClamp<T>());
+        return clampTo<T>(roundForImpreciseConversion<T>(result), 0, defaultMaximumForClamp<T>());
     }
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 template <CSSValueID IdForNone>
 AtomicString StyleBuilderConverter::convertString(StyleResolverState&, const CSSValue& value)
 {
     if (value.isStringValue())
         return AtomicString(toCSSStringValue(value).value());
     ASSERT(toCSSPrimitiveValue(value).getValueID() == IdForNone);
     return nullAtom;
 }
 
 } // namespace blink
 
 #endif