Add a circlular memory indicator to the recent panel view (2/2)

Modifications:
It allows to be toggled on/off as well as setting a custom location.

Colors are not solid, they have an alpha channel to provide
transparency, this way it doesnt interfer much with the recents
panel view.

Screenshot:
http://goo.gl/Th7g0j

Frameworks Part:
https://gerrit.omnirom.org/#/c/3008/

Change-Id: If02666e084abe689a83afde3da33ccbdaa6c337a
Merge "Add a circlular memory indicator to the recent panel view (2/2)" into android-4.4