Add support for the object-fit CSS property.

Source/core/css/CSSParser-in.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
@@ skipping 618 matching lines @@
     case CSSPropertyListStylePosition: // inside | outside | inherit
         if (valueID == CSSValueInside || valueID == CSSValueOutside)
             return true;
         break;
     case CSSPropertyListStyleType:
         // See section CSS_PROP_LIST_STYLE_TYPE of file CSSValueKeywords.in
         // for the list of supported list-style-types.
         if ((valueID >= CSSValueDisc && valueID <= CSSValueKatakanaIroha) || valueID == CSSValueNone)
             return true;
         break;
+    case CSSPropertyObjectFit:
+        if (RuntimeEnabledFeatures::objectFitPositionEnabled()) {
+            if (valueID == CSSValueFill || valueID == CSSValueContain || valueID == CSSValueCover || valueID == CSSValueNone || valueID == CSSValueScaleDown)
+                return true;
+        }
+        break;
     case CSSPropertyOutlineStyle: // (<border-style> except hidden) | auto | inherit
         if (valueID == CSSValueAuto || valueID == CSSValueNone || (valueID >= CSSValueInset && valueID <= CSSValueDouble))
             return true;
         break;
     case CSSPropertyOverflowWrap: // normal | break-word
     case CSSPropertyWordWrap:
         if (valueID == CSSValueNormal || valueID == CSSValueBreakWord)
             return true;
         break;
     case CSSPropertyOverflowX: // visible | hidden | scroll | auto | overlay | inherit
@@ skipping 288 matching lines @@
     case CSSPropertyCaptionSide:
     case CSSPropertyClear:
     case CSSPropertyDirection:
     case CSSPropertyDisplay:
     case CSSPropertyEmptyCells:
     case CSSPropertyFloat:
     case CSSPropertyFontStyle:
     case CSSPropertyImageRendering:
     case CSSPropertyListStylePosition:
     case CSSPropertyListStyleType:
+    case CSSPropertyObjectFit:
     case CSSPropertyOutlineStyle:
     case CSSPropertyOverflowWrap:
     case CSSPropertyOverflowX:
     case CSSPropertyOverflowY:
     case CSSPropertyPageBreakAfter:
     case CSSPropertyPageBreakBefore:
     case CSSPropertyPageBreakInside:
     case CSSPropertyPointerEvents:
     case CSSPropertyPosition:
     case CSSPropertyResize:
@@ skipping 1782 matching lines @@
     case CSSPropertyCaptionSide:
     case CSSPropertyClear:
     case CSSPropertyDirection:
     case CSSPropertyDisplay:
     case CSSPropertyEmptyCells:
     case CSSPropertyFloat:
     case CSSPropertyFontStyle:
     case CSSPropertyImageRendering:
     case CSSPropertyListStylePosition:
     case CSSPropertyListStyleType:
+    case CSSPropertyObjectFit:
     case CSSPropertyOutlineStyle:
     case CSSPropertyOverflowWrap:
     case CSSPropertyOverflowX:
     case CSSPropertyOverflowY:
     case CSSPropertyPageBreakAfter:
     case CSSPropertyPageBreakBefore:
     case CSSPropertyPageBreakInside:
     case CSSPropertyPointerEvents:
     case CSSPropertyPosition:
     case CSSPropertyResize:
@@ skipping 9154 matching lines @@
 {
     // The tokenizer checks for the construct of an+b.
     // However, since the {ident} rule precedes the {nth} rule, some of those
     // tokens are identified as string literal. Furthermore we need to accept
     // "odd" and "even" which does not match to an+b.
     return equalIgnoringCase(token, "odd") || equalIgnoringCase(token, "even")
         || equalIgnoringCase(token, "n") || equalIgnoringCase(token, "-n");
 }
 
 }