Merge "Add isDreaming method to DreamManager" into rvc-dev am: 95f8aba25e am: c372de9a0c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11040365

Change-Id: Ie2f5c3404323622f9d3dba254fca2f870fdd93a6