Auto merge of #15695 - canaltinova:stylo-font-face, r=Manishearth

Stylo: Add constructors for @font-face descriptors

<!-- Please describe your changes on the following line: -->
Part of https://bugzilla.mozilla.org/show_bug.cgi?id=1340728

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix [Bug #1340728](https://bugzilla.mozilla.org/show_bug.cgi?id=1340728)

<!-- Either: -->
- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/15695)
<!-- Reviewable:end -->

1 files changed, 20 insertions, 0 deletions

diff --git a/components/style/gecko_bindings/bindings.rs b/components/style/gecko_bindings/bindings.rs
index 5ee54e51383..a64c70d0b51 100644
--- a/components/style/gecko_bindings/bindings.rs
+++ b/components/style/gecko_bindings/bindings.rs
@@ -841,6 +841,26 @@ extern "C" {
                                       len: i32);
 }
 extern "C" {
+    pub fn Gecko_CSSValue_SetString(css_value: nsCSSValueBorrowedMut,
+                                    string: nsString);
+}
+extern "C" {
+    pub fn Gecko_CSSValue_SetArray(css_value: nsCSSValueBorrowedMut,
+                                   len: i32);
+}
+extern "C" {
+    pub fn Gecko_CSSValue_SetURL(css_value: nsCSSValueBorrowedMut,
+                                 uri: ServoBundledURI);
+}
+extern "C" {
+    pub fn Gecko_CSSValue_SetLocal(css_value: nsCSSValueBorrowedMut,
+                                   family: nsString);
+}
+extern "C" {
+    pub fn Gecko_CSSValue_SetInteger(css_value: nsCSSValueBorrowedMut,
+                                     integer: i32);
+}
+extern "C" {
     pub fn Gecko_CSSValue_Drop(css_value: nsCSSValueBorrowedMut);
 }
 extern "C" {