Add support for the object-fit CSS property.

Source/core/rendering/style/RenderStyleConstants.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 187 matching lines @@
 enum EUserDrag {
     DRAG_AUTO, DRAG_NONE, DRAG_ELEMENT
 };
 
 // CSS3 User Select Values
 
 enum EUserSelect {
     SELECT_NONE, SELECT_TEXT, SELECT_ALL
 };
 
+// CSS3 Image Values
+enum EObjectFit { ObjectFitFill, ObjectFitContain, ObjectFitCover, ObjectFitNone, ObjectFitScaleDown };
+
 // Word Break Values. Matches WinIE, rather than CSS3
 
 enum EWordBreak {
     NormalWordBreak, BreakAllWordBreak, BreakWordBreak
 };
 
 enum EOverflowWrap {
     NormalOverflowWrap, BreakOverflowWrap
 };
 
@@ skipping 283 matching lines @@
 // Reasonable maximum to prevent insane font sizes from causing crashes on some platforms (such as Windows).
 static const float maximumAllowedFontSize = 1000000.0f;
 
 #if ENABLE(CSS3_TEXT)
 enum TextIndentLine { TextIndentFirstLine, TextIndentEachLine };
 #endif
 
 } // namespace WebCore
 
 #endif // RenderStyleConstants_h