--- a/layout/style/ServoBindings.cpp
+++ b/layout/style/ServoBindings.cpp
@@ -1430,24 +1430,26 @@ Gecko_SetCounterFunction(nsStyleContentD
   return ptr;
 }
 
 nsStyleGradient*
 Gecko_CreateGradient(uint8_t aShape,
                      uint8_t aSize,
                      bool aRepeating,
                      bool aLegacySyntax,
+                     bool aMozLegacySyntax,
                      uint32_t aStopCount)
 {
   nsStyleGradient* result = new nsStyleGradient();
 
   result->mShape = aShape;
   result->mSize = aSize;
   result->mRepeating = aRepeating;
   result->mLegacySyntax = aLegacySyntax;
+  result->mMozLegacySyntax = aMozLegacySyntax;
 
   result->mAngle.SetNoneValue();
   result->mBgPosX.SetNoneValue();
   result->mBgPosY.SetNoneValue();
   result->mRadiusX.SetNoneValue();
   result->mRadiusY.SetNoneValue();
 
   nsStyleGradientStop dummyStop;

--- a/layout/style/ServoBindings.h
+++ b/layout/style/ServoBindings.h
@@ -307,16 +307,17 @@ void Gecko_SetLayerImageImageValue(nsSty
 void Gecko_SetImageElement(nsStyleImage* image, nsIAtom* atom);
 void Gecko_CopyImageValueFrom(nsStyleImage* image, const nsStyleImage* other);
 void Gecko_InitializeImageCropRect(nsStyleImage* image);
 
 nsStyleGradient* Gecko_CreateGradient(uint8_t shape,
                                       uint8_t size,
                                       bool repeating,
                                       bool legacy_syntax,
+                                      bool moz_legacy_syntax,
                                       uint32_t stops);
 
 // list-style-image style.
 void Gecko_SetListStyleImageNone(nsStyleList* style_struct);
 void Gecko_SetListStyleImageImageValue(nsStyleList* style_struct,
                                   mozilla::css::ImageValue* aImageValue);
 void Gecko_CopyListStyleImageFrom(nsStyleList* dest, const nsStyleList* src);