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This is a reland of 775612b8

Original change's description:
> [scheduler] Add task type and queue type to tracing.
> 
> R=skyostil@chromium.org
> 
> Change-Id: Id0aea377558e876c8178e82eb3a170f678c415cc
> Reviewed-on: https://chromium-review.googlesource.com/1140717
> Commit-Queue: Alexander Timin <altimin@chromium.org>
> Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#576201}

Change-Id: I8289cc417637e7e605dbb5f9df8cc6ea68fa457f
Reviewed-on: https://chromium-review.googlesource.com/1143224Reviewed-by: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577159}