Keep InCallUI in memory (2/3)[DO NOT MERGE]

Here, we set the sharedUserId so the dummy InCallUI.apk can
share the process.

Change-Id: Idfb7fa760eacc8d6e46d50ce682fb06c0acfc8f4
Merge "Keep InCallUI in memory (2/3)[DO NOT MERGE]" into pac-4.4