blink: Add backdrop-filter support

Source/core/animation/DeferredLegacyStyleInterpolationTest.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/DeferredLegacyStyleInterpolation.h"
 
 #include "core/css/CSSInheritedValue.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/CSSValueList.h"
@@ skipping 72 matching lines @@
     EXPECT_TRUE(test(CSSPropertyWebkitFilter, "drop-shadow(20px 10vw green)"));
     EXPECT_TRUE(test(CSSPropertyWebkitFilter, "drop-shadow(0px 0px 0px currentcolor)"));
     EXPECT_FALSE(test(CSSPropertyWebkitFilter, "opacity(1)"));
     EXPECT_FALSE(test(CSSPropertyWebkitFilter, "saturate(0)"));
     EXPECT_FALSE(test(CSSPropertyWebkitFilter, "grayscale(1)"));
     EXPECT_FALSE(test(CSSPropertyWebkitFilter, "invert(1)"));
     EXPECT_FALSE(test(CSSPropertyWebkitFilter, "sepia(1)"));
     EXPECT_TRUE(test(CSSPropertyWebkitFilter, "url(#svgfilter)"));
 }
 
+TEST_F(AnimationDeferredLegacyStyleInterpolationTest, BackdropFilter)
+{
+    EXPECT_FALSE(test(CSSPropertyBackdropFilter, "hue-rotate(180deg) blur(6px)"));
+    EXPECT_FALSE(test(CSSPropertyBackdropFilter, "grayscale(0) blur(0px)"));
+    EXPECT_FALSE(test(CSSPropertyBackdropFilter, "none"));
+    EXPECT_FALSE(test(CSSPropertyBackdropFilter, "brightness(0) contrast(0)"));
+    EXPECT_FALSE(test(CSSPropertyBackdropFilter, "drop-shadow(20px 10px green)"));
+    EXPECT_TRUE(test(CSSPropertyBackdropFilter, "drop-shadow(20px 10vw green)"));
+    EXPECT_TRUE(test(CSSPropertyBackdropFilter, "drop-shadow(0px 0px 0px currentcolor)"));
+    EXPECT_FALSE(test(CSSPropertyBackdropFilter, "opacity(1)"));
+    EXPECT_FALSE(test(CSSPropertyBackdropFilter, "saturate(0)"));
+    EXPECT_FALSE(test(CSSPropertyBackdropFilter, "grayscale(1)"));
+    EXPECT_FALSE(test(CSSPropertyBackdropFilter, "invert(1)"));
+    EXPECT_FALSE(test(CSSPropertyBackdropFilter, "sepia(1)"));
+    EXPECT_TRUE(test(CSSPropertyBackdropFilter, "url(#svgfilter)"));
 }
+}