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Add |source_device_id_| for Accelerator. Then the InputDevice can be
gotten from the |source_device_id_| when perform the accelerator. This
is added to differentiate the side volume button from all the other
volume control input currently.

Bug: 937907
Change-Id: Iec90a6b35cef9db6e6eaceb50aef26c07ba1b3ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1559434
Commit-Queue: Min Chen <minch@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649690}