calc expressions should support time, angle and frequency values.

Source/core/css/CSSCalculationValue.h

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * 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
@@ skipping 36 matching lines @@
 class CalcExpressionNode;
 class Length;
 
 enum CalcOperator {
     CalcAdd = '+',
     CalcSubtract = '-',
     CalcMultiply = '*',
     CalcDivide = '/'
 };
 
+// The order of this enum should not change since its elements are used as indices
+// in the addSubtractResult matrix.
 enum CalculationCategory {
     CalcNumber = 0,
     CalcLength,
     CalcPercent,
     CalcPercentNumber,
     CalcPercentLength,
+    CalcAngle,
+    CalcTime,
+    CalcFrequency,
     CalcOther
 };
 
 class CSSCalcExpressionNode : public RefCountedWillBeGarbageCollected<CSSCalcExpressionNode> {
     DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(CSSCalcExpressionNode);
 public:
     enum Type {
         CssCalcPrimitiveValue = 1,
         CssCalcBinaryOperation
     };
@@ skipping 67 matching lines @@
     const RefPtrWillBeMember<CSSCalcExpressionNode> m_expression;
     const bool m_nonNegative;
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSCalcValue, isCalcValue());
 
 } // namespace blink
 
 
 #endif // CSSCalculationValue_h