Auto merge of #14598 - DominoTree:master, r=canaltinova

Fix linear gradient's specified form #13892

<!-- Please describe your changes on the following line: -->
WIP for #13892

---
<!-- 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 #13892  (github issue number if applicable).

<!-- Either: -->
- [x] 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/14598)
<!-- Reviewable:end -->

components/style/values/computed/mod.rs

@@ -11,7 +11,7 @@ use style_traits::ToCss;
 use super::{CSSFloat, specified};
 
 pub use cssparser::Color as CSSColor;
-pub use self::image::{EndingShape as GradientShape, Gradient, GradientKind, Image};
+pub use self::image::{AngleOrCorner, EndingShape as GradientShape, Gradient, GradientKind, Image};
 pub use self::image::{LengthOrKeyword, LengthOrPercentageOrKeyword};
 pub use super::{Either, None_};
 pub use super::specified::{Angle, BorderStyle, GridLine, Time, UrlOrNone};