Retrieve scan interval and window lengths from Settings.Global.

The default values are staying the same. Reading from Settings.Global
will enable us to run an experiment tweaking these parameters to
determine impact on battery life.

Bug: 71765044
Test: Manual. Looking for existing unit tests... Any pointers?
Change-Id: Ie44d605447866f0ec6d327f4d1852f490e452eb4
1 file changed