blink: Add backdrop-filter support

Source/core/animation/css/CSSPropertyEquality.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/animation/css/CSSPropertyEquality.h"
 
 #include "core/animation/css/CSSAnimations.h"
 #include "core/style/DataEquivalency.h"
 #include "core/style/ComputedStyle.h"
@@ skipping 246 matching lines @@
         return a.columnGap() == b.columnGap();
     case CSSPropertyWebkitColumnRuleColor:
         return a.columnRuleColor() == b.columnRuleColor()
             && a.visitedLinkColumnRuleColor() == b.visitedLinkColumnRuleColor();
     case CSSPropertyWebkitColumnRuleWidth:
         return a.columnRuleWidth() == b.columnRuleWidth();
     case CSSPropertyWebkitColumnWidth:
         return a.columnWidth() == b.columnWidth();
     case CSSPropertyWebkitFilter:
         return a.filter() == b.filter();
+    case CSSPropertyBackdropFilter:
+        return a.backdropFilter() == b.backdropFilter();
     case CSSPropertyWebkitMaskBoxImageOutset:
         return a.maskBoxImageOutset() == b.maskBoxImageOutset();
     case CSSPropertyWebkitMaskBoxImageSlice:
         return a.maskBoxImageSlices() == b.maskBoxImageSlices();
     case CSSPropertyWebkitMaskBoxImageSource:
         return dataEquivalent(a.maskBoxImageSource(), b.maskBoxImageSource());
     case CSSPropertyWebkitMaskBoxImageWidth:
         return a.maskBoxImageWidth() == b.maskBoxImageWidth();
     case CSSPropertyWebkitMaskImage:
         return dataEquivalent(a.maskImage(), b.maskImage());
@@ skipping 52 matching lines @@
         return a.svgStyle().ry() == b.svgStyle().ry();
     case CSSPropertyZIndex:
         return a.hasAutoZIndex() == b.hasAutoZIndex() && (a.hasAutoZIndex() || a.zIndex() == b.zIndex());
     default:
         ASSERT_NOT_REACHED();
         return true;
     }
 }
 
 }