blink: Add backdrop-filter support

Source/core/css/resolver/AnimatedStyleBuilder.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 538 matching lines @@
         return;
     case CSSPropertyWebkitColumnWidth:
         style->setColumnWidth(clampTo(toAnimatableDouble(value)->toDouble(), std::numeric_limits<float>::epsilon()));
         return;
     case CSSPropertyWebkitColumnRuleWidth:
         style->setColumnRuleWidth(clampTo<unsigned short>(toAnimatableDouble(value)->toDouble()));
         return;
     case CSSPropertyWebkitFilter:
         style->setFilter(toAnimatableFilterOperations(value)->operations());
         return;
+    case CSSPropertyBackdropFilter:
+        style->setBackdropFilter(toAnimatableFilterOperations(value)->operations());
+        return;
     case CSSPropertyWebkitMaskBoxImageOutset:
         style->setMaskBoxImageOutset(animatableValueToBorderImageLengthBox(value, state));
         return;
     case CSSPropertyWebkitMaskBoxImageSlice:
         style->setMaskBoxImageSlices(animatableValueToLengthBox(toAnimatableLengthBoxAndBool(value)->box(), state, ValueRangeNonNegative));
         style->setMaskBoxImageSlicesFill(toAnimatableLengthBoxAndBool(value)->flag());
         return;
     case CSSPropertyWebkitMaskBoxImageSource:
         style->setMaskBoxImageSource(state.styleImage(property, toAnimatableImage(value)->toCSSValue()));
         return;
@@ skipping 113 matching lines @@
     case CSSPropertyRy:
         style->setRy(animatableValueToLength(value, state, ValueRangeNonNegative));
         return;
 
     default:
         ASSERT_NOT_REACHED();
     }
 }
 
 } // namespace blink