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The perf collector issues dbus commands to run perf as root but the dbus client
is not thread safe.
Temporarily, map the collector task runner to the current thread (UI), until we
can implement a fix in the dbus client.

BUG=b:139816773

Change-Id: I02766ed512a10f1868dda7bd58205397997ef9e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764319Reviewed-by: Gabriel Marin <gmx@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Commit-Queue: Gabriel Marin <gmx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689163}