--- a/layout/style/ServoBindings.cpp
+++ b/layout/style/ServoBindings.cpp
@@ -4,16 +4,17 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "mozilla/ServoBindings.h"
 
 #include "ChildIterator.h"
 #include "gfxFontFamilyList.h"
 #include "nsAttrValueInlines.h"
+#include "nsCSSProps.h"
 #include "nsCSSParser.h"
 #include "nsCSSRuleProcessor.h"
 #include "nsContentUtils.h"
 #include "nsDOMTokenList.h"
 #include "nsIContentInlines.h"
 #include "nsIDOMNode.h"
 #include "nsIDocument.h"
 #include "nsIFrame.h"
@@ -1047,16 +1048,23 @@ Gecko_CSSValue_SetFunction(nsCSSValueBor
 }
 
 nsCSSValueBorrowedMut
 Gecko_CSSValue_GetArrayItem(nsCSSValueBorrowedMut aCSSValue, int32_t aIndex)
 {
   return &aCSSValue->GetArrayValue()->Item(aIndex);
 }
 
+
+bool
+Gecko_PropertyId_IsPrefEnabled(nsCSSPropertyID id)
+{
+  return nsCSSProps::IsEnabled(id);
+}
+
 void
 Gecko_LoadStyleSheet(css::Loader* aLoader,
                      ServoStyleSheet* aParent,
                      RawServoImportRuleBorrowed aImportRule,
                      const uint8_t* aURLString,
                      uint32_t aURLStringLength,
                      const uint8_t* aMediaString,
                      uint32_t aMediaStringLength)

--- a/layout/style/ServoBindings.h
+++ b/layout/style/ServoBindings.h
@@ -288,16 +288,17 @@ void Gecko_CSSValue_SetAbsoluteLength(ns
 void Gecko_CSSValue_SetNumber(nsCSSValueBorrowedMut css_value, float number);
 void Gecko_CSSValue_SetKeyword(nsCSSValueBorrowedMut css_value, nsCSSKeyword keyword);
 void Gecko_CSSValue_SetPercentage(nsCSSValueBorrowedMut css_value, float percent);
 void Gecko_CSSValue_SetAngle(nsCSSValueBorrowedMut css_value, float radians);
 void Gecko_CSSValue_SetCalc(nsCSSValueBorrowedMut css_value, nsStyleCoord::CalcValue calc);
 void Gecko_CSSValue_SetFunction(nsCSSValueBorrowedMut css_value, int32_t len);
 nsCSSValueBorrowedMut Gecko_CSSValue_GetArrayItem(nsCSSValueBorrowedMut css_value, int32_t index);
 NS_DECL_THREADSAFE_FFI_REFCOUNTING(nsCSSValueSharedList, CSSValueSharedList);
+bool Gecko_PropertyId_IsPrefEnabled(nsCSSPropertyID id);
 
 // Style-struct management.
 #define STYLE_STRUCT(name, checkdata_cb)                                       \
   void Gecko_Construct_Default_nsStyle##name(                                  \
     nsStyle##name* ptr,                                                        \
     RawGeckoPresContextBorrowed pres_context);                                 \
   void Gecko_CopyConstruct_nsStyle##name(nsStyle##name* ptr,                   \
                                          const nsStyle##name* other);          \