Stop ViewCapture functionality if memory is low, Delete data

Bug: 295447707
Test: Manually tested that logs stopped being emitted when onLowMemory()
was called. Also, tested that ViewCapture data was erased by using shell commands to get ViewCapture data and also send onLowMemory events.

Change-Id: Ib0909ce211b77c349906add1a8ac85fba7649e74
1 file changed