customtabs: Add paranoia to isCallerForegroundOrSelf() due to NPEs in the wild.
We have a number of NPEs reported from devices in the
wild. Unfortunately, we only know that they happen on L pre-MR1, and
from warmup(). This commits adds null checks to prevent these from
crashing the client (reported by GSA).
(cherry picked from commit f974fe4e5a32803b83592a014a82db683cb485f7)
Review URL: https://codereview.chromium.org/2415573002 .
1 file changed