Add the precise-width integer check in cpp.py

Add a PRESUBMIT check to ensure new |unsigned short| use don't
come in.

Bug: 929986
Change-Id: Ib4031362495ceedd94bc7e33fcbb913aea1e6ee2
Reviewed-on: https://chromium-review.googlesource.com/c/1493642
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Darwin Huang <huangdarwin@chromium.org>
Commit-Queue: Miyoung Shin <myid.shin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636674}
2 files changed