Merge "When a Virtual Display is plugged in, we create a corresponding surface whose mutation should be owned by mSyncRoot(Owned by DisplayManagerService). However, there is an operation of getting the defaultSize of this Display which is performed without honouring the mSyncRoot." into tm-dev am: c47e9d00 am: 1e351b81

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17238069

Change-Id: I3019d47318dc65fe0edc425dc664cfcaca9594c1