GitLab

Channel count in the IDL is a 32 bit integer. Ensure we use that
and not a 64 bit integer in C++.

BUG=879657

Change-Id: I6415d2d0965f8b4dbd2aa79d831ef8dfc1f49038
Reviewed-on: https://chromium-review.googlesource.com/c/1348969Reviewed-by: Hongchan Choi <hongchan@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611370}