Add CSS Transition support to registered custom properties

third_party/WebKit/Source/core/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 "core/css/CSSPropertyEquality.h"
 
+#include "core/css/CSSValue.h"
 #include "core/style/ComputedStyle.h"
 #include "core/style/DataEquivalency.h"
 #include "core/style/ShadowList.h"
 
 // TODO(ikilpatrick): generate this file.
 
 namespace blink {
 
 namespace {
 
@@ skipping 351 matching lines @@
       return a.svgStyle().ry() == b.svgStyle().ry();
     case CSSPropertyZIndex:
       return a.hasAutoZIndex() == b.hasAutoZIndex() &&
              (a.hasAutoZIndex() || a.zIndex() == b.zIndex());
     default:
       NOTREACHED();
       return true;
   }
 }
 
+bool CSSPropertyEquality::registeredCustomPropertiesEqual(
+    const AtomicString& propertyName,
+    const ComputedStyle& a,
+    const ComputedStyle& b) {
+  return dataEquivalent(a.getRegisteredVariable(propertyName),
+                        b.getRegisteredVariable(propertyName));
+}
+
 }  // namespace blink