Fix FileManager thread panic and other misc improvements
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy --faster` does not report any errors
- [x] There are tests for these changes
Changes:
- Add shut down logic for FileManager thread
- Add an unit test for filemanager_thread
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Avoid an unnecessary runtime check in Pipeline::create().
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Implemented webdriver SetWindowSize.
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- [X] These changes fix#10467 (github issue number if applicable).
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Scheduler with fewer threads
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- [X] These changes fix#11268.
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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.