blink: Add backdrop-filter support

Source/core/animation/ElementAnimations.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 49 matching lines @@
         if (effect.isCurrent()) {
             if (effect.affects(PropertyHandle(CSSPropertyOpacity)))
                 style.setHasCurrentOpacityAnimation(true);
             if (effect.affects(PropertyHandle(CSSPropertyTransform))
                 || effect.affects(PropertyHandle(CSSPropertyRotate))
                 || effect.affects(PropertyHandle(CSSPropertyScale))
                 || effect.affects(PropertyHandle(CSSPropertyTranslate)))
                 style.setHasCurrentTransformAnimation(true);
             if (effect.affects(PropertyHandle(CSSPropertyWebkitFilter)))
                 style.setHasCurrentFilterAnimation(true);
+            if (effect.affects(PropertyHandle(CSSPropertyBackdropFilter)))
+                style.setHasCurrentBackdropFilterAnimation(true);
         }
     }
 
     if (style.hasCurrentOpacityAnimation())
         style.setIsRunningOpacityAnimationOnCompositor(m_defaultStack.hasActiveAnimationsOnCompositor(CSSPropertyOpacity));
     if (style.hasCurrentTransformAnimation())
         style.setIsRunningTransformAnimationOnCompositor(m_defaultStack.hasActiveAnimationsOnCompositor(CSSPropertyTransform));
     if (style.hasCurrentFilterAnimation())
         style.setIsRunningFilterAnimationOnCompositor(m_defaultStack.hasActiveAnimationsOnCompositor(CSSPropertyWebkitFilter));
+    if (style.hasCurrentBackdropFilterAnimation())
+        style.setIsRunningBackdropFilterAnimationOnCompositor(m_defaultStack.hasActiveAnimationsOnCompositor(CSSPropertyBackdropFilter));
 }
 
 void ElementAnimations::restartAnimationOnCompositor()
 {
     for (const auto& entry : m_animations)
         entry.key->restartAnimationOnCompositor();
 }
 
 DEFINE_TRACE(ElementAnimations)
 {
@@ skipping 36 matching lines @@
     // TODO(rune@opera.com): The FontFaceCache version number may be increased without forcing
     // a style recalc (see crbug.com/471079). ComputedStyle objects created with different cache
     // versions will not be considered equal as Font::operator== will compare versions, hence
     // ComputedStyle::operator== will return false. We avoid using baseComputedStyle (the check for
     // isFallbackValid()) in that case to avoid triggering the ComputedStyle comparison ASSERT
     // in updateBaseComputedStyle.
     return m_animationStyleChange && (!m_baseComputedStyle || m_baseComputedStyle->font().isFallbackValid());
 }
 
 } // namespace blink