Exposing some ViewRoomImple methods in shared lib

This would allow us to implement SyncRtSurfaceTransactionApplierCompat directly in Launcher
so that we can better handle surface lifecycle

Also removing java 7 restriction from librayr as the latest gradle properly handle java-8 jars

Bug: 148885018
Bug: 148194313
Test: Verified jar works with Launcher
Change-Id: I57adfea4b41ce12c8f8f2697dc554feca7ccc6b6