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Before this CL, there was only a per-thread CompositorTaskRunner. So any compositor task was running on per-thread compositor task runner even when the task belongs to ASG.

This CL introduces per-ASG CompositorTaskRunner to run ASG’s compositor tasks, and migrate MediaFactory to use per-ASG CompositorTaskRunner. The remaining callsites will be migrated on following CL.

Bug: 1105403
Change-Id: I548e4aaeefee8c229d2f31c26a5a30b3d6386ed2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601019
Commit-Queue: Minoru Chikamune <chikamune@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843579}