Add support for the object-position CSS property.

Source/core/animation/css/CSSAnimations.cpp

 /*
  * Copyright (C) 2013 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 302 matching lines @@
     case CSSPropertyLineHeight:
     case CSSPropertyListStyleImage:
     case CSSPropertyMarginBottom:
     case CSSPropertyMarginLeft:
     case CSSPropertyMarginRight:
     case CSSPropertyMarginTop:
     case CSSPropertyMaxHeight:
     case CSSPropertyMaxWidth:
     case CSSPropertyMinHeight:
     case CSSPropertyMinWidth:
+    case CSSPropertyObjectPosition:
     case CSSPropertyOpacity:
     case CSSPropertyOrphans:
     case CSSPropertyOutlineColor:
     case CSSPropertyOutlineOffset:
     case CSSPropertyOutlineWidth:
     case CSSPropertyPaddingBottom:
     case CSSPropertyPaddingLeft:
     case CSSPropertyPaddingRight:
     case CSSPropertyPaddingTop:
     case CSSPropertyRight:
@@ skipping 41 matching lines @@
     case CSSPropertyWordSpacing:
     case CSSPropertyZIndex:
     case CSSPropertyZoom:
         return true;
     default:
         return false;
     }
 }
 
 } // namespace WebCore