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GpuInfoService is used for GPU info collection and is running on the
short-lived info-collection GPU process only.
This CL separates GpuInfoService from the regular GpuService because it
is not running on the same GPU process.

Bug:1048903

Change-Id: I6f11cbfec8b17d4e5c4ac9865b26542aa6dd619d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2154388Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762068}