Revert "Revert "[2/2] Dialer: Add a non-intrusive dialoger for incoming calls""

This reverts commit 359ba415c14cd558404794098cb19bbca2a616f7.
Keep InCallUI in memory (2/3)

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

Change-Id: Idfb7fa760eacc8d6e46d50ce682fb06c0acfc8f4