Allow applications to show the navigation bar in expanded desktop mode.

This is used by the settings app to show the navigation bar when editing
it.

Change-Id: Idc8fa5e49f31175dea603d7f1a1ef94ffab7249d
Merge "Allow applications to show the navigation bar in expanded desktop mode." into cm-10.1
framework: merge CyanogenMod

Change-Id: I04d3faaef1a0da22c88d5fbd673964851dfe6653