Fix WindowProviderService test on instant mode

Previously test cannot hold SYSTEM_ALERT_WINDOW permission in instant
mode. This CL fixes it by adding it in #adoptShellPermissionIdentity.

Test: atest StrictModeTest --instant in user builde
fixes: 197534629
Change-Id: I6aa3a4be918f68fc2c74018a86d23bef30c558a0
1 file changed