Split out CSSPrimitiveValue's PropertyID into CSSCustomIdentValue

third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp

Index: third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp b/third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp
index a674a752eb404361f5a73001ecf50e5689237a14..175041f8c8a18819c6a9b856f640b149ad9c2304 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp
@@ -671,10 +671,13 @@ void StyleBuilderFunctions::applyValueCSSPropertyWillChange(StyleResolverState&
     Vector<CSSPropertyID> willChangeProperties;
 
     for (auto& willChangeValue : toCSSValueList(*value)) {
+        if (willChangeValue->isCustomIdentValue()) {
+            willChangeProperties.append(toCSSCustomIdentValue(*willChangeValue).id());
+            continue;
+        }
+
         CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(willChangeValue.get());
-        if (primitiveValue->isPropertyID())
-            willChangeProperties.append(primitiveValue->getPropertyID());
-        else if (primitiveValue->getValueID() == CSSValueContents)
+        if (primitiveValue->getValueID() == CSSValueContents)
             willChangeContents = true;
         else if (primitiveValue->getValueID() == CSSValueScrollPosition)
             willChangeScrollPosition = true;
@@ -737,7 +740,7 @@ void StyleBuilderFunctions::applyValueCSSPropertyContent(StyleResolverState& sta
                 state.style()->setUnique();
             else
                 state.parentStyle()->setUnique();
-            QualifiedName attr(nullAtom, AtomicString(toCSSCustomIdentValue(functionValue->item(0))->value()), nullAtom);
+            QualifiedName attr(nullAtom, AtomicString(toCSSCustomIdentValue(functionValue->item(0))->string()), nullAtom);
             const AtomicString& value = state.element()->getAttribute(attr);
             state.style()->setContent(value.isNull() ? emptyString() : value.string(), didSet);
             didSet = true;