Update nsstring.
This should fix bug 1334579
<!-- Please describe your changes on the following line: -->
r? @bholley @heycam or @Manishearth
<!-- 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/15582)
<!-- Reviewable:end -->
Major pain point is that I had to write the bitfield stuff manually, but that
should be resolved soon again.
Now we generate proper layout for _every_ struct, including field offsets \o/.
Update cssparser to 0.9
<!-- Please describe your changes on the following line: -->
---
<!-- 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
- [ ] These changes fix #__ (github issue number if applicable).
<!-- 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/15552)
<!-- Reviewable:end -->
Add rejection of out-of-range values for single-timing-functions
<!-- Please describe your changes on the following line: -->
This PR fixes#15344, checking for the `cubic-bezier p1x/p2x` and `steps` first value after parsing.
There are unit tests that check for parsing of invalid values - I was not sure if there was a more suitable place, so I created a file (name subject to change).
Q: I found this [test suite](https://github.com/servo/servo/blob/master/tests/unit/style/properties/serialization.rs#L592), and noticed that the `p2x` value is out of range, but the test does not fail - is this because there is no check when calling the function itself?
Thanks!
---
<!-- 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#15344
<!-- Either: -->
- [X] There are tests for these changes
<!-- 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/15539)
<!-- Reviewable:end -->
fixes quote transform: none serialization
<!-- Please describe your changes on the following line: -->
Adds a unit test to reproduce faulty behaviour, and serializes "none" correctly when provided an empty list.
---
<!-- 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#15209 (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/15546)
<!-- Reviewable:end -->
Stylo: Implement align-content and justify-content
This implements parsing and serialization of `align-content` and `justify-content` for Stylo. The implementation should match Gecko exactly (which means it's not exactly up-to-date with the latest draft spec). This is a Stylo-only change; it leaves the current Servo code (which matches an older spec) unchanged for now. r? @Manishearth
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix part of #15001 (github issue number if applicable).
- [x] These changes do not require tests because they are stylo-only
<!-- 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/15533)
<!-- Reviewable:end -->
-added parsing and serialization for grid-{row,column}-gap
<!-- Please describe your changes on the following line: -->
I have added an implementation for grid-{row,column}-gap based on the predefined type property suggestion in the description
---
<!-- 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
- [ ] These changes fix#15310 (github issue number if applicable).
<!-- 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/15466)
<!-- Reviewable:end -->
This is really part of the "recalc" rather than the "compute" work. But more to
the point, it lets us early-return on the style-sharing stuff (see the next patch).
