This is similar to Services.tm.idleDispatchToMainThread, but provides an
IdleDeadline argument to its callbacks, the same way that
Window.requestIdleCallback does.
The IdleDeadline argument was necessary for my first attempt at this bug. It's
not necessary for the current version, but I suspect it will be useful in
other areas, and it also avoids some XPConnect overhead, so it's probably
worth keeping.
MozReview-Commit-ID: FtrbNkE7Vz5
Expose requestIdleCallback on Window and implement running callbacks
in idle periods by posting rICs to the main threads idle queue.
MozReview-Commit-ID: KSYQsyaZ6is
Expose requestIdleCallback on Window and implement running callbacks
in idle periods by posting rICs to the main threads idle queue.
MozReview-Commit-ID: KSYQsyaZ6is
