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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Pipeline documentation comments
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Rewrote the documentation comments for `pipeline.rs`.
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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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This reimplemntation of the feature uses ScrollRootIds to scroll
particular scrollable areas of the page.
Fixes#13736.
Fixes#10753.
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Update to webrender 0.10.0
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Changes necessary to build servor with webrender 0.10.0
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switch to using webrender_traits::ImageData
update use of webrender_traits::StackingContext in layout
use webrender_traits::channel::msg_channel in webgl ipc
fix use of resource_override_path in components/servo/lib
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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Script lookup iframes by frameid
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Lookup iframes by `FrameId` rather than `PipelineId`. This should make lookup much more reliable, since the frame id doesn't change.
cc @ConnorGBrewster @aneeshusa
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Tidying up constellation.
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Some miscellaneous tidying up to the constellation:
- improve the efficiency of testing emptiness of the joint session past and future,
- add some helpful debug logs,
- make the if-statement for pipeline traversal easier to read.
r? @ConnorGBrewster
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