Fix modes for fetching classic worker script and introduce parser metadata for request
While reading [the spec](https://html.spec.whatwg.org/multipage/#fetch-a-classic-worker-script) for `fetch a classic worker script`, I found the `mode` and `credential-mode` are opposite to the spec. So, the first commit will fix it.
Also, I found there's a `parser metadata` for `request` so I tried to introduce it in this PR as well.
For WPT, I found there's a `/workers/constructors/Worker/same-origin.html` which was disabled in #3180. We pass most of the tests now.
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Build Linux Nightly with OpenSSL 1.1.0
Servo Nightly fails to run on Ubuntu 19.04 (disco) as it doesn't have a libssl1.0.0 package.
OpenSSL 1.1.x is supported since [Debian Stretch](https://packages.debian.org/en/stretch/libssl1.1) (currently Debian Stable) and [Ubuntu 18.04](https://packages.ubuntu.com/bionic/libssl1.1) (used by base.dockerfile).
Ancient Debian + Ubuntu releases are still able to compile Servo using their most recent OpenSSL (1.0.x).
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Install webrtc-required components for gstreamer
We will need to reinstall gst-plugins-bad on the existing mac builders, but this should help any future mac builders that are created.
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Create CanvasRect for OffscreenCanvas
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Created CanvasRect fot OffscreenCanvas and Updated Testcases
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Support WorkerOptions for Worker
I'd like to start working on updating SW related codes and I found it will have some algorithms related to module workers. And I found parts of the spec update is related to [fetch a module worker script graph](https://html.spec.whatwg.org/multipage/#fetch-a-module-worker-script-tree), maybe it's worth being a separate PR?
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