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We need to be able to log UKM metrics from the compositor thread of the GPU
process, so initialize a global instance of MojoUkmRecorder to do that.

TBR=sky@chromium.org
(for DEPS change)

Bug: 717629
Change-Id: I69bedeed7c16bb69b50b7e12da590ba1c69a3c9c
Reviewed-on: https://chromium-review.googlesource.com/744544
Commit-Queue: Mikhail Fomitchev <mfomitchev@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516015}