[Variables] Enable get/setProperty and similar APIs from the CSSOM

third_party/WebKit/Source/bindings/core/v8/custom/V8CSSStyleDeclarationCustom.cpp

Index: third_party/WebKit/Source/bindings/core/v8/custom/V8CSSStyleDeclarationCustom.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/custom/V8CSSStyleDeclarationCustom.cpp b/third_party/WebKit/Source/bindings/core/v8/custom/V8CSSStyleDeclarationCustom.cpp
index 0cc9c9baddb22283131baef596a38da60d55adc2..fb9dc2d268d490ac3aa256844736a8fdbc812902 100644
--- a/third_party/WebKit/Source/bindings/core/v8/custom/V8CSSStyleDeclarationCustom.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/custom/V8CSSStyleDeclarationCustom.cpp
@@ -203,6 +203,7 @@ void V8CSSStyleDeclaration::namedPropertyGetterCustom(v8::Local<v8::Name> name,
     CSSPropertyID resolvedProperty = resolveCSSPropertyID(unresolvedProperty);
 
     CSSStyleDeclaration* impl = V8CSSStyleDeclaration::toImpl(info.Holder());
+    // TODO(leviw): This API doesn't support custom properties.
     RefPtrWillBeRawPtr<CSSValue> cssValue = impl->getPropertyCSSValueInternal(resolvedProperty);
     if (cssValue) {
         v8SetReturnValueStringOrNull(info, cssValue->cssText(), info.GetIsolate());
@@ -224,7 +225,8 @@ void V8CSSStyleDeclaration::namedPropertySetterCustom(v8::Local<v8::Name> name,
 
     TOSTRING_VOID(V8StringResource<TreatNullAsNullString>, propertyValue, value);
     ExceptionState exceptionState(ExceptionState::SetterContext, getPropertyName(resolveCSSPropertyID(unresolvedProperty)), "CSSStyleDeclaration", info.Holder(), info.GetIsolate());
-    impl->setPropertyInternal(unresolvedProperty, propertyValue, false, exceptionState);
+    // TODO(leviw): This API doesn't support custom properties.
+    impl->setPropertyInternal(unresolvedProperty, String(), propertyValue, false, exceptionState);
 
     if (exceptionState.throwIfNeeded())
         return;