Add exit reason ENTER_BUBBLE Flag: EXEMPT bug fix Test: none Bug: 431144417 Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:57f24d54e86d8ffdb7336b2a90b3fb12ffcf0416 Merged-In: I14a01f70850ff36dc736090bd2e4d20082b3b0c7 Change-Id: I14a01f70850ff36dc736090bd2e4d20082b3b0c7