calc expressions should support time, angle and frequency values.

Source/core/css/CSSPrimitiveValue.h

Index: Source/core/css/CSSPrimitiveValue.h
diff --git a/Source/core/css/CSSPrimitiveValue.h b/Source/core/css/CSSPrimitiveValue.h
index 76846ab687dc2594d74dc633f276f7ae97ceb738..944c3ee52a4cf628665de8dcc0473eac1f48d634 100644
--- a/Source/core/css/CSSPrimitiveValue.h
+++ b/Source/core/css/CSSPrimitiveValue.h
@@ -285,6 +285,8 @@ public:
             return getValue<T>();
         if (timeUnit == Milliseconds && m_primitiveUnitType == CSS_S)
             return getValue<T>() * 1000;
+        if (m_primitiveUnitType == CSS_CALC)
+            return getValue<T>();

[alancutter (OOO until 2018), 2014/07/02 05:56:11]

This should be returning a value relative to timeUnit.
This should also ASSERT that the calc holds a time value.

[Timothy Loh, 2014/07/02 07:06:13]

Alternatively we can just simplify this function to something like "double
computeSeconds()"; the function is only used in a couple of places anyway.

         ASSERT_NOT_REACHED();
         return 0;
     }