blink: Add backdrop-filter support

Source/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 124 matching lines @@
         case CSSPropertyAliasWebkitTransform:
         case CSSPropertyTransformStyle:
         case CSSPropertyAliasWebkitTransformStyle:
         case CSSPropertyPerspective:
         case CSSPropertyAliasWebkitPerspective:
         case CSSPropertyWebkitMask:
         case CSSPropertyWebkitMaskBoxImage:
         case CSSPropertyWebkitClipPath:
         case CSSPropertyWebkitBoxReflect:
         case CSSPropertyWebkitFilter:
+        case CSSPropertyBackdropFilter:
         case CSSPropertyZIndex:
         case CSSPropertyPosition:
             return true;
         case CSSPropertyMixBlendMode:
         case CSSPropertyIsolation:
             if (RuntimeEnabledFeatures::cssCompositingEnabled())
                 return true;
             break;
         default:
             break;
@@ skipping 339 matching lines @@
     if (style.writingMode() != TopToBottomWritingMode && (style.display() == BOX || style.display() == INLINE_BOX))
         style.setWritingMode(TopToBottomWritingMode);
 
     if (parentStyle.isDisplayFlexibleOrGridBox()) {
         style.setFloating(NoFloat);
         style.setDisplay(equivalentBlockDisplay(style.display(), style.isFloating(), !m_useQuirksModeStyles));
     }
 }
 
 }