Add ANR annotation to AppExitInfo reason

Bug: 220354436

Test: force anr, check field "reason"
user request after error: Input dispatching timed out (b2c1d00 com.example.myapplication/com.example.myapplication.MainActivity (server) is not responding. Waited 5004ms for MotionEvent(deviceId=4, eventTime=24557057000, source=TOUCHSCREEN, displayId=0, action=DOWN, actionButton=0x00000000, flags=0x00000000, metaState=0x00000000, buttonState=0x00000000, classification=NONE, edgeFlags=0x00000000, xPrecision=1.0, yPrecision=1.0, xCursorPosition=nan, yCursorPosition=nan, pointers=[0: (933.0, 1926.0)]), policyFlags=0x62000000)

Change-Id: Ibb317ffe5b21b52d4bef9ee27f072647f147c20b