Update immersive confirmation.

1. Disable panic mechanism for expanded desktop.
2. Separate confirmation for each expanded desktop style.
3. Add new layout for the case when navigation
   bar is hidden but statusbar is visible.

Change-Id: I5914d655bd5f9315ac4cc6fc7d70cc4ee45bb7b2
frameworks/base: add app launch timeline instrumentation

Displayed Activity is often being used to measure application
launch times. However Displayed Activity only accounts for a
subset of the app launch. This additional instrumentation will
allow for more accurate measurements of applications launch
times.

Change-Id: Ic0bc6f0110c3ecbbce9eccd9357818a8a898475e
framework/base: get proper obb mountpoint based on user handle

Due to invalid obb mount point, CTS test case was failing to mount
obb file at /mnt/shell/emulated/0. Added new API to support user
based mount point for obb.

Change-Id: I9f113bd98ab3a4af00dd7f788b2dc3bc45627d6c
CRs-Fixed: 587497