Previously we add uid to PendingStartActivityUids at activity start.
Now we also add uid to PendingStartActivityUids at activity resumed
because we can not wait for updateOomAdj() to be run by a runnable that
WindowManager send to DisplayThread at activity resumed.
At ActivityManagerService.getProcessStatesAndOomScoresForPIDs(), if the
ProcessRecord is in PendingStartActivityUids, we hard code the
ProcessRecord to be PROCESS_STATE_TOP and FOREGROUND_APP_ADJ, ahead of
result of updateOomAdj() the comes later.
Bug: 155143386, 157180494
Test: Reproduce steps of 155143386, swipe between GCA and
Snapchat, camera access is allowed after swipe.
Change-Id: Ia11b0e3400e4df851b250beb01dcfda43580668b
08ab384989