Compute initial values for registered custom properties.

third_party/WebKit/Source/core/css/PropertyRegistration.cpp

 // Copyright 2016 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/PropertyRegistration.h"
 
 #include "core/animation/CSSValueInterpolationType.h"
 #include "core/css/CSSSyntaxDescriptor.h"
 #include "core/css/CSSValueList.h"
 #include "core/css/CSSVariableReferenceValue.h"
 #include "core/css/PropertyDescriptor.h"
 #include "core/css/PropertyRegistry.h"
 #include "core/css/parser/CSSTokenizer.h"
 #include "core/css/parser/CSSVariableParser.h"
+#include "core/css/resolver/StyleBuilderConverter.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/StyleChangeReason.h"
 
 namespace blink {
 
 static bool computationallyIndependent(const CSSValue& value) {
   DCHECK(!value.isCSSWideKeyword());
 
   if (value.isVariableReferenceValue())
@@ skipping 89 matching lines @@
           SyntaxError,
           "The initial value provided does not parse for the given syntax.");
       return;
     }
     if (!computationallyIndependent(*initial)) {
       exceptionState.throwDOMException(
           SyntaxError,
           "The initial value provided is not computationally independent.");
       return;
     }
+    initial =
+        &StyleBuilderConverter::convertRegisteredPropertyInitialValue(*initial);
     RefPtr<CSSVariableData> initialVariableData = CSSVariableData::create(
         tokenizer.tokenRange(), isAnimationTainted, false);
     registry.registerProperty(
         atomicName, syntaxDescriptor, descriptor.inherits(), initial,
         std::move(initialVariableData), std::move(interpolationTypes));
   } else {
     if (!syntaxDescriptor.isTokenStream()) {
       exceptionState.throwDOMException(
           SyntaxError,
           "An initial value must be provided if the syntax is not '*'");
       return;
     }
     registry.registerProperty(atomicName, syntaxDescriptor,
                               descriptor.inherits(), nullptr, nullptr,
                               std::move(interpolationTypes));
   }
 
   // TODO(timloh): Invalidate only elements with this custom property set
   document->setNeedsStyleRecalc(SubtreeStyleChange,
                                 StyleChangeReasonForTracing::create(
                                     StyleChangeReason::PropertyRegistration));
 }
 
 }  // namespace blink