Implement MutationObserver.disconnect()
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This implements https://dom.spec.whatwg.org/#dom-mutationobserver-disconnect
I added a `node_list` to the `MutationObserver` struct to keep track of the nodes involved in an observer because otherwise I could not find a way to unregister the observers on the node themselves without traversing the whole document tree. Let me know if there's something I missed.
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Implement beforeunload event and infrastructure
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Implementation of:
1. https://html.spec.whatwg.org/multipage/#prompt-to-unload-a-document, and
2. https://html.spec.whatwg.org/multipage/#unload-a-document
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- [ ] These changes fix#10787 and fix#20485 and fix#20588 and fix#20496 (github issue number if applicable).
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0 is not among the valid values for a wrap mode or filter, so it won't
ever be returned unless the driver is broken, and even if it was a
valid value we would want to pass it through.
MutationObserver api: Implement takeRecords() and characterData mutations
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I started by looking at adding support for `takeRecords()` to get fluent.js to work on Servo. To get the wpt tests to pass I ended up implementing character data mutations (most of the plumbing was already there) and this fixed a few more tests.
We are still missing support for `disconnect()`, which I keep for a followup.
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Make session history aware of URLs
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Delegate resource reading to embedder
Now the embedder provides the content of the files itself. Now, on Android, we can use regular assets instead of unzipping all the resources on the scared at startup.
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The test document_domain_setter.html now fails, but AFAIK the origin
comparison can never be true (document.origin is the unprefixed domain,
while the loaded iframe is from www1.…), and that test fails in all
major browsers because of security exceptions anyway.
Implement WebGL GetRenderbufferParameter
This needed a bump of gleam to version 0.4.33 for this https://github.com/servo/gleam/pull/162
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I think my changes in test expectations are pretty naive and I have to wait for the PR to run on CI to see what the actual impact is. I'd like some guidance on this, too.
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Moved Canvas rendering to a single thread.
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Implements the "Subsequent Steps" part of the [NCSU Canvas rendering project.](https://github.com/servo/servo/wiki/Canvas-rendering-project)
I moved most of the functionality from CanvasPaintThread to CanvasData, so CanvasPaintThread essentially just pulls the info out of the message and calls a method on a particular CanvasData element.
I ran into some awkwardness with the fact that one can only take a single mutable reference from a hashmap, though. DrawImageInOther is not really possible to do with only one reference at a time, so it awkwardly still lives in CanvasPaintThread, basically. I also would've preferred to take the reference at the top as soon as I get the CanvasId, since that looks cleaner than having them all start with "canvas_paint_thread.canvases.get_mut[&canvas_id].unwrap()" but that makes trying to take the second reference for DrawImageInOther fail to compile. I'm definitely open to suggestions on how to make that less gross.
The timed single-canvas drawing improved in performance from around ~2.2ms to around ~1.7ms. Slither.io runs better and doesn't crash, but I'm not having it crash on my copy from before these changes, so I don't know if that's new behavior or not.
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Remove insaccessible history states
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Update to smallbitvec 2.1
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Implement gl.getParameter(gl.ALIASED_LINE_WIDTH_RANGE)
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Implement gl.getParameter(gl.ALIASED_LINE_WIDTH_RANGE)
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It doesn't actually matter because this is only called from
WebGLRenderingContext::BindTexture, which already checks the target,
but better be safe than sorry.
