acc1a5cc72
1. Remove references to TaskQueueImpl in blink scheduler and create
(Main|NonMain)ThreadTaskQueues directly, rather than routing
through SequenceManager. This simplifies the construction path,
fixes layering, and is needed if we move blink TQs oilpan.
2. Remove MainThreadTaskQueueForTest in blink since it wasn't used.
This also means task queues are always created with a TaskQueueImpl,
so require this in the TaskQueue constructor and remove
NullTaskRunner.
3. Use plain TaskQueue instead of TestTaskQueue everywhere except
SequenceManager unit tests. TestTaskQueue only exists to get at
the TaskQueueImpl and test lifetime (via a weak ptr), so it
generally isn't needed elsewhere.
4. Finally, remove SequenceManager::CreateTaskQueueWithType()
Bug: 1143007
Change-Id: If40c62e17f5dda301f0ce729c6a692440608b031
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4336340
Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Scott Haseley <shaseley@chromium.org>
Reviewed-by: Carlos Caballero Grolimund <carlscab@google.com>
Cr-Commit-Position: refs/heads/main@{#1118767}
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