Add .clang-tidy to //ui/views

This file documents the clang-tidy passes performed already on
//ui/views and configures clang-tidy with these checks automatically.

BUG=940732

Change-Id: I9bc731dbbe2e03e27046d9999d5e7bd64a66f4c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1536761
Auto-Submit: Robert Liao <robliao@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#643729}
1 file changed