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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Report blank lines that follow an open brace
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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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Fix FileManager thread panic and other misc improvements
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- Add shut down logic for FileManager thread
- Add an unit test for filemanager_thread
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Implemented webdriver SetWindowSize.
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Changes include:
- Introduce an IpcSend trait to abstract over a collection of IpcSenders
- Implement ResourceThreads collection to abstract the resource-related
sub threads across the component
- Rename original ResourceThread and ControlMsg into an unifed CoreResource__
to accommodate above changes and avoid confusions
It's a pointless abstraction that propagates the obsolete chan terminology,
swaps the order in which the sender and receiver are returned, and hides a
source of panics.
