Add PerformanceResourceTiming: ResponseEnd
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1. Added `ResponseEnd` to `ResourceAttribute` enum in `net_traits` and added it to the `set_attribute` function on `ResourceFetchTiming`
2. Added `response_end` field to `performanceresourcetiming.rs`
3. In `http_loader.rs`, set ResponseEnd after response body read is complete, or before return due to network error.
I could use a little guidance on testing. After building and running `wpt` tests, I noticed that some tests now "Pass" when they were expected to "Fail". As per the wiki instructions, I've removed those expectations from the `metadata`.
I noticed that there are a handful of other "failing" test expectations associated with `responseEnd`, but those still do not pass. I looked through some similar PRs (`connectEnd`, `redirectStart`, etc) and saw that they also still have a few failing test expectations here and there. Does that mean this is OK for now? How can I better understand which tests we expect to resolve for a given issue? Thanks!
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Add css-align tests with failure expectations.
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Enabled `css-align` wpt tests.
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- this conforms to follow-hyperlinks spec step 13
- this conforms to window-open spec step 14.3
- replace uses of `referrer_url` with `referrer`
- in Request class, change "no-referrer" to ""
- set websocket fetch referrer to "no-referrer"
Use a threadpool for fetch
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Make serializeToString serialize document nodes correctly
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This is the fix for ScriptThread panic when `new XMLSerializer().serializeToString(document);` is called.
r?@jdm
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Implement DocumentFragment XML serialization.
When serializing a DocumentFragment node, we should follow [this guy](https://w3c.github.io/DOM-Parsing/#dfn-xml-serializing-a-documentfragment-node) and serialize the node's immediate children. This commit makes that change.
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Add default paths for WPT tests
Set the following default configs for WPT tests.
```--ca-cert-path=tests\wpt\web-platform-tests\tools\certs\cacert.pem
--host-key-path=tests\wpt\web-platform-tests\tools\certs\web-platform.test.key
--host-cert-path=tests\wpt\web-platform-tests\tools\certs\web-platform.test.pem
--ssl-type=pregenerated
```
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Add connectEnd attribute to PerformanceResourceTiming interface
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Implement srcObject logic for Blob media providers
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Shutdown player when HTMLMediaElement is dropped
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