Add new enums for enter/exit reasons Flag: EXEMPT BUGFIX Bug: 444605677 Test: m Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:ddee028a96440894cacd58c1c5bef80c3aee5430 Merged-In: Icb85c9df90edace582c592d1a4f6176e12c0c740 Change-Id: Icb85c9df90edace582c592d1a4f6176e12c0c740