Implement non-visible pipeline and iframe visibility methods
This addresses #9566 and a good part of #9751, specifically:
* Pipeline has a notion of visibility
* IFrame setVisible/getVisible interface with IFrame's pipeline visibility
* IFrame mozbrowservisibilitychange responds to changes in visibility
* Pipeline visibility is used to limit animations (requestAnimationFrame does not tick animations when hidden) and to increase timer intervals (currently set to a minimum of 1 second while hidden)
Absent for now are any changes to the Document API and general implementation of the Page Visibility API, since the more interesting parts require knowledge of whether the user agent is minimized, OS screen locked, etc.
cc @paulrouget @jdm
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Add support for navigating by a delta
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This adds support for passing a delta with `NavigationDirection`. This will be used with `history.go`
r? @asajeffrey
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Report blank lines that follow an open brace
This automates something that I find myself frequently commenting on in PRs.
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Split up Constellation::handle_requests.
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The function is too long to easily work with.
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Simplify and improve Pipeline creation.
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Record the frame type (IFrame or MozBrowserIFrame) in the pipeline.
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This is a first step towards supporting the notion of multiple top-level browsing contexts in Servo, by making the constellation aware of which content is loaded in a mozbrowser iframe.
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We needed a separate thread in the chrome process because communication to the
compositor is done through a trait object, and cross-process virtual calls are
forbidden.
Also, the fact that these messages are ultimately handled by the compositor is
an implementation detail; conceptually, the relevant constellation is supposed
to handle these messages.
So instead, the script thread will now send the messages to the constellation,
which will ask the compositor to handle them.
Use associated types to improve LayoutThreadFactory and ScriptThreadFactory.
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Either:
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