Use caller's uid and pid for resource tracking for untrusted caller

If an untrusted caller creates MediaCodec with other's uid/pid,
these should be counted toward the caller itself. Otherwise they
could bypass resourcemanager and create codecs that's out of
the system, not blamed for battery usage and never be reclaimed.

bug: 168307955
bug: 154733526
test: manually check that if mediatranscoding is made untrusted,
the MediaCodec instance will be added with its own uid/pid, and
appears in 'adb shell dumpsys media.resource_manager'. After test
run, it should dispear in 'adb shell dumpsys media.resource_manager'.

Change-Id: I943317f71ea43470d86c5e0ea5b703d23f08a678