GitLab

Use enum class instead of enum for PaintButtonMode
enum class is more type safety.

Bug: 940736
Change-Id: If4135af54748a1f9383aba3605916a593aaba0cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824052
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701467}