Add support for the object-fit CSS property.

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 3341 matching lines @@
     case CSSValueNone:
         return FontDescription::NoneKerning;
     default:
         break;
     }
 
     ASSERT_NOT_REACHED();
     return FontDescription::AutoKerning;
 }
 
+template<> inline CSSPrimitiveValue::CSSPrimitiveValue(EObjectFit e)
+    : CSSValue(PrimitiveClass)
+{
+    m_primitiveUnitType = CSS_VALUE_ID;
+    switch (e) {
+    case ObjectFitFill:
+        m_value.valueID = CSSValueFill;
+        break;
+    case ObjectFitContain:
+        m_value.valueID = CSSValueContain;
+        break;
+    case ObjectFitCover:
+        m_value.valueID = CSSValueCover;
+        break;
+    case ObjectFitNone:
+        m_value.valueID = CSSValueNone;
+        break;
+    case ObjectFitScaleDown:
+        m_value.valueID = CSSValueScaleDown;
+        break;
+    }
+}
+
+template<> inline CSSPrimitiveValue::operator EObjectFit() const
+{
+    switch (m_value.valueID) {
+    case CSSValueFill:
+        return ObjectFitFill;
+    case CSSValueContain:
+        return ObjectFitContain;
+    case CSSValueCover:
+        return ObjectFitCover;
+    case CSSValueNone:
+        return ObjectFitNone;
+    case CSSValueScaleDown:
+        return ObjectFitScaleDown;
+    default:
+        ASSERT_NOT_REACHED();
+        return ObjectFitFill;
+    }
+}
+
 template<> inline CSSPrimitiveValue::CSSPrimitiveValue(FontSmoothingMode smoothing)
     : CSSValue(PrimitiveClass)
 {
     m_primitiveUnitType = CSS_VALUE_ID;
     switch (smoothing) {
     case AutoSmoothing:
         m_value.valueID = CSSValueAuto;
         return;
     case NoSmoothing:
         m_value.valueID = CSSValueNone;
@@ skipping 1372 matching lines @@
         break;
     }
 
     ASSERT_NOT_REACHED();
     return TouchActionNone;
 }
 
 }
 
 #endif