Move custom property isInheritedProperty storage logic into ComputedStyle

third_party/WebKit/Source/core/style/StyleInheritedVariables.cpp

 // 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.
 
 #include "core/style/StyleInheritedVariables.h"
 
 #include "core/style/DataEquivalency.h"
 
 namespace blink {
 
@@ skipping 39 matching lines @@
     return nullptr;
   return result->value.get();
 }
 
 void StyleInheritedVariables::setRegisteredVariable(
     const AtomicString& name,
     const CSSValue* parsedValue) {
   m_registeredData.set(name, const_cast<CSSValue*>(parsedValue));
 }
 
-CSSValue* StyleInheritedVariables::registeredVariable(
+const CSSValue* StyleInheritedVariables::registeredVariable(
     const AtomicString& name) const {
   auto result = m_registeredData.find(name);
   if (result != m_registeredData.end())
     return result->value.get();
   if (m_root)
     return m_root->registeredVariable(name);
   return nullptr;
 }
 
 void StyleInheritedVariables::removeVariable(const AtomicString& name) {
@@ skipping 11 matching lines @@
         new HashMap<AtomicString, RefPtr<CSSVariableData>>(m_root->m_data));
     for (auto it = m_data.begin(); it != m_data.end(); ++it)
       result->set(it->key, it->value);
   } else {
     result.reset(new HashMap<AtomicString, RefPtr<CSSVariableData>>(m_data));
   }
   return result;
 }
 
 }  // namespace blink