Merge "add dream start/stop logs" into rvc-dev am: 8b5b71ddd9 am: cb549069ec am: 448244b352 am: 3301d43967

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11897359

Change-Id: Ifa295ff5a03807ce25b6337da664580e8dbcaacd