--- a/layout/style/ServoBindings.cpp
+++ b/layout/style/ServoBindings.cpp
@@ -1234,16 +1234,56 @@ Gecko_CSSValue_GetCalc(nsCSSValueBorrowe
 
 void
 Gecko_CSSValue_SetFunction(nsCSSValueBorrowedMut aCSSValue, int32_t aLen)
 {
   nsCSSValue::Array* arr = nsCSSValue::Array::Create(aLen);
   aCSSValue->SetArrayValue(arr, eCSSUnit_Function);
 }
 
+void
+Gecko_CSSValue_SetString(nsCSSValueBorrowedMut aCSSValue, const nsString aString)
+{
+  MOZ_ASSERT(aCSSValue->GetUnit() == eCSSUnit_Null);
+  aCSSValue->SetStringValue(aString, eCSSUnit_String);
+}
+
+void
+Gecko_CSSValue_SetArray(nsCSSValueBorrowedMut aCSSValue, int32_t aLength)
+{
+  MOZ_ASSERT(aCSSValue->GetUnit() == eCSSUnit_Null);
+  RefPtr<nsCSSValue::Array> array
+    = nsCSSValue::Array::Create(aLength);
+  aCSSValue->SetArrayValue(array, eCSSUnit_Array);
+}
+
+void
+Gecko_CSSValue_SetURL(nsCSSValueBorrowedMut aCSSValue,
+                      ServoBundledURI aURI)
+{
+  MOZ_ASSERT(aCSSValue->GetUnit() == eCSSUnit_Null);
+  RefPtr<css::URLValue> url = aURI.IntoCssUrl();
+  aCSSValue->SetURLValue(url.get());
+}
+
+void
+Gecko_CSSValue_SetLocal(nsCSSValueBorrowedMut aCSSValue, const nsString aFamily)
+{
+  MOZ_ASSERT(aCSSValue->GetUnit() == eCSSUnit_Null);
+  aCSSValue->SetStringValue(aFamily, eCSSUnit_Local_Font);
+}
+
+void
+Gecko_CSSValue_SetInteger(nsCSSValueBorrowedMut aCSSValue, int32_t aInteger)
+{
+  MOZ_ASSERT(aCSSValue->GetUnit() == eCSSUnit_Null ||
+    aCSSValue->GetUnit() == eCSSUnit_Integer);
+  aCSSValue->SetIntValue(aInteger, eCSSUnit_Integer);
+}
+
 nsCSSValueBorrowedMut
 Gecko_CSSValue_GetArrayItem(nsCSSValueBorrowedMut aCSSValue, int32_t aIndex)
 {
   return &aCSSValue->GetArrayValue()->Item(aIndex);
 }
 
 nsCSSValueBorrowed
 Gecko_CSSValue_GetArrayItemConst(nsCSSValueBorrowed aCSSValue, int32_t aIndex)

--- a/layout/style/ServoBindings.h
+++ b/layout/style/ServoBindings.h
@@ -330,16 +330,21 @@ nsStyleCoord::CalcValue Gecko_CSSValue_G
 
 void Gecko_CSSValue_SetAbsoluteLength(nsCSSValueBorrowedMut css_value, nscoord len);
 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);
+void Gecko_CSSValue_SetString(nsCSSValueBorrowedMut css_value, const nsString string);
+void Gecko_CSSValue_SetArray(nsCSSValueBorrowedMut css_value, int32_t len);
+void Gecko_CSSValue_SetURL(nsCSSValueBorrowedMut css_value, ServoBundledURI uri);
+void Gecko_CSSValue_SetLocal(nsCSSValueBorrowedMut css_value, const nsString family);
+void Gecko_CSSValue_SetInteger(nsCSSValueBorrowedMut css_value, int32_t integer);
 void Gecko_CSSValue_Drop(nsCSSValueBorrowedMut css_value);
 NS_DECL_THREADSAFE_FFI_REFCOUNTING(nsCSSValueSharedList, CSSValueSharedList);
 bool Gecko_PropertyId_IsPrefEnabled(nsCSSPropertyID id);
 
 void Gecko_nsStyleFont_SetLang(nsStyleFont* font, nsIAtom* atom);
 void Gecko_nsStyleFont_CopyLangFrom(nsStyleFont* aFont, const nsStyleFont* aSource);
 
 const nsMediaFeature* Gecko_GetMediaFeatures();