Refactor run_in_headless_android_emulator.py out of mach test-android-startup
… and make it more careful about not leaving zombie processes behind.
<!-- 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/21200)
<!-- Reviewable:end -->
Fix hittesting on HiDPI screens
This fixes some regressions introduced in #21087 due to treating logical coordinates as physical ones without converting between them correctly.
---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix#21168
- [x] These changes do not require tests because we do not have the ability to test embedding input yet.
<!-- 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/21190)
<!-- Reviewable:end -->
Make fetch() API use same-origin credentials by default
<!-- 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
- [X] These changes fix#21146 (github issue number if applicable).
<!-- Either: -->
- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- 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/21187)
<!-- Reviewable:end -->
Android: run ./mach package implicitly after ./mach build
The result of `./mach build` for Android is a `.so` file that cannot be used on its own, so running build without package is presumably never useful.
<!-- 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/21183)
<!-- Reviewable:end -->
style: Sync changes from mozilla-central.
https://bugzilla.mozilla.org/show_bug.cgi?id=1476054
See each individual commit for details. I skipped the import of bug 1467277, which can't be done until euclid is updated everywhere.
Use remote-event task source in EventSource
<!-- Please describe your changes on the following line: -->
Follow up on https://github.com/servo/servo/pull/21126, this again 'changes nothing', but will be useful for https://github.com/servo/servo/issues/21114 in the context of https://github.com/servo/servo/pull/21111.
Trying to break up work into smaller PR's ;)
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [ ] `./mach build -d` does not report any errors
- [ ] `./mach test-tidy` does not report any errors
- [ ] These changes fix#21112 (github issue number if applicable).
<!-- Either: -->
- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- 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/21170)
<!-- Reviewable:end -->