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I add a tracing tool in ChromeOS, and this is the Chrome side code to
interact with the hal_adapter in ChromeOS through mojo. Also add the
tracing of the camera capture request and get result.

CQ-DEPEND=CL:1158095
BUG=b:109714458
TEST=Open about://tracing in Chrome, click Record, and choose CrosCamera.
Open any camera app, and close it. Click Stop button in Chrome, and there
will have some events show on the UI. In the process of camera service, and
if you open the camera in chrome the browser process will also have some
events.
TEST=Pass capture_unittests

Change-Id: I1ae67b8ca49d63679228eea5b579818b0b3d3686
Reviewed-on: https://chromium-review.googlesource.com/1158106
Commit-Queue: Jyun-jhe Chou <hobexd@google.com>
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589120}