Implement setter for document.domain
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This PR implements the setter for `document.domain`.
It builds on #15438 and #15478, only the last commit is part of this PR.
It includes tests for similar-origin security checks.
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- [X] These changes fix#934.
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Frames in the constellation store LoadData rather than just URLs.
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Include LoadData in each session history entry, so that when we reload discarded documents we can include POST data etc.
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- [X] These changes fix#14888
- [X] These changes do not require tests because we don't test document discarding.
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Refactor to send iframe resize messages directly from layout thread to constellation
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- [X] These changes fix#14682.
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r? @jdm
passing tests:
tests/wpt/mozilla/tests/css/matchMedia.html, tests/wpt/mozilla/tests/mozilla/window_resize_not_triggered_on_load.html, tests/wpt/mozilla/tests/mozilla/iframe/resize_after_load.html, tests/wpt/mozilla/tests/css/meta_viewport_resize.html
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Index the session past correctly when discarding.
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Oops, indexed from the wrong end when discarding documents in #14312.
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Implement browsing context discarding
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Implement browsing context discarding (https://html.spec.whatwg.org/multipage/browsers.html#discard-a-document).
* When a pipeline is closed, inform the script thread whether the browsing context is to be discarded.
* In script threads, synchronously discard any similar-origin documents and browsing contexts.
* When a browsing context is discarded, it loses the reference to the active document, but the window keeps it, so we need to move the `Document` pointer from `BrowsingContext` to `Window`.
* Fix the webIDL for Window to make parent and top optional (the spec says they can return null when the browsing context is discarded).
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Rename ScriptChan in constellation to EventLoop
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We currently have a type `ScriptChan` in the constellation, which is named after its implementation rather than its semantics. In the spec, the nearest concept seems to be event loop https://html.spec.whatwg.org/multipage/#event-loop.
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Reimplement scrolling to fragments
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- [x] These changes fix#13736, #10753 (github issue number if applicable).
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This reimplemntation of the feature uses ScrollRootIds to scroll
particular scrollable areas of the page.
Fixes#13736.
Fixes#10753.
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Script thread with no root document
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This PR removes the single root document from the script thread, and replaces it by a lookup table from `PipelineId`s to `Document`s. This is needed if we're going to share script threads, as per #633.
The last commit is the one that matters, the ones before are #13646.
cc @jdm @Ms2ger @ConnorGBrewster
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