WIP Support var() references in registered custom property keyframes

third_party/WebKit/Source/core/css/resolver/CSSVariableResolver.h

 // Copyright 2015 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.
 
 #ifndef CSSVariableResolver_h
 #define CSSVariableResolver_h
 
 #include "core/CSSPropertyNames.h"
 #include "core/css/parser/CSSParserToken.h"
 #include "platform/wtf/HashSet.h"
 #include "platform/wtf/text/AtomicString.h"
 #include "platform/wtf/text/AtomicStringHash.h"
 
 namespace blink {
 
+class CSSCustomPropertyDeclaration;
 class CSSParserTokenRange;
 class CSSPendingSubstitutionValue;
 class CSSVariableData;
 class CSSVariableReferenceValue;
+class PropertyRegistration;
 class PropertyRegistry;
 class StyleResolverState;
 class StyleInheritedVariables;
 class StyleNonInheritedVariables;
 
 class CSSVariableResolver {
   STACK_ALLOCATED();
 
  public:
   CSSVariableResolver(const StyleResolverState&);
 
+  const CSSValue* ResolveRegisteredCustomPropertyAnimationKeyframe(
+      const PropertyRegistration&,
+      const CSSCustomPropertyDeclaration& keyframe);
+
   void ResolveVariableDefinitions();
 
   // Shorthand properties are not supported.
   const CSSValue* ResolveVariableReferences(CSSPropertyID,
                                             const CSSValue&,
                                             bool disallow_animation_tainted);
 
   void ComputeRegisteredVariables();
 
  private:
@@ skipping 48 matching lines @@
   HashSet<AtomicString> variables_seen_;
   // Resolution doesn't finish when a cycle is detected. Fallbacks still
   // need to be tracked for additional cycles, and invalidation only
   // applies back to cycle starts.
   HashSet<AtomicString> cycle_start_points_;
 };
 
 }  // namespace blink
 
 #endif  // CSSVariableResolver