GitLab

Use enum class instead of enum for ButtonKey::ClickAction
enum class is more type safety.

Bug: 940736
Change-Id: Iaf2caca28d4fc72efb933761030f365454325e80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1844913
Commit-Queue: Hwanseung Lee <hs1217.lee@samsung.com>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703590}