<!-- Please describe your changes on the following line: --> Fixes #13424 As of now this PR (Work in Progress), will try to implement (partially) on algorithms namely : [Schedule_Job](https://w3c.github.io/ServiceWorker/#schedule-job-algorithm), [Run_Job](https://w3c.github.io/ServiceWorker/#run-job-algorithm), [Register_Job](https://w3c.github.io/ServiceWorker/#register-algorithm). An issue that needs to be addressed: Resolving the promise value after queueing it as a `dom_manipulation_task` by wrapping it in a runnable `RunJobHandler` (which holds a `TrustedPromise`) and trying to call `resolve_native` results in a crash. [stack trace](http://paste.ofcode.org/zdjJ9npBgX6JsyWQkJjnYk) @jdm I am not sure what's causing the crash ? --- <!-- 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. --> Source-Repo: https://github.com/servo/servo Source-Revision: 0ea0ade71dfd445841035abb5f3ea35161b075d2