Unprefix -webkit-filter and add a pixel test for it.

sky/engine/core/css/resolver/StyleAdjuster.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 101 matching lines @@
         case CSSPropertyOpacity:
         case CSSPropertyTransform:
         case CSSPropertyWebkitTransform:
         case CSSPropertyTransformStyle:
         case CSSPropertyWebkitTransformStyle:
         case CSSPropertyPerspective:
         case CSSPropertyWebkitPerspective:
         case CSSPropertyWebkitMask:
         case CSSPropertyWebkitMaskBoxImage:
         case CSSPropertyWebkitClipPath:
-        case CSSPropertyWebkitFilter:
+        case CSSPropertyFilter:
         case CSSPropertyZIndex:
         case CSSPropertyPosition:
             return true;
         default:
             break;
         }
     }
     return false;
 }
 
@@ skipping 121 matching lines @@
         // FIXME: Once we implement pagination controls, overflow-x should default to hidden
         // if overflow-y is set to -webkit-paged-x or -webkit-page-y. For now, we'll let it
         // default to auto so we can at least scroll through the pages.
         style->setOverflowX(OAUTO);
     } else if (style->overflowY() == OVISIBLE && style->overflowX() != OVISIBLE) {
         style->setOverflowY(OAUTO);
     }
 }
 
 }