Improve CSS Style matching spec compliance

Source/core/css/CSSPrimitiveValueMappings.h

 /*
  * Copyright (C) 2007 Alexey Proskuryakov <ap@nypop.com>.
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ skipping 3215 matching lines @@
 }
 
 template<> inline CSSPrimitiveValue::CSSPrimitiveValue(FontStyle italic)
     : CSSValue(PrimitiveClass)
 {
     init(UnitType::ValueID);
     switch (italic) {
     case FontStyleNormal:
         m_value.valueID = CSSValueNormal;
         return;
+    case FontStyleOblique:
+        m_value.valueID = CSSValueOblique;
+        return;
     case FontStyleItalic:
         m_value.valueID = CSSValueItalic;
         return;
     }
 
     ASSERT_NOT_REACHED();
     m_value.valueID = CSSValueNormal;
 }
 
 template<> inline CSSPrimitiveValue::operator FontStyle() const
 {
     ASSERT(isValueID());
     switch (m_value.valueID) {
     case CSSValueOblique:
-    // FIXME: oblique is the same as italic for the moment...
+        return FontStyleOblique;
     case CSSValueItalic:
         return FontStyleItalic;
     case CSSValueNormal:
         return FontStyleNormal;
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return FontStyleNormal;
 }
@@ skipping 1417 matching lines @@
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return ScrollSnapTypeNone;
 }
 
 } // namespace blink
 
 #endif