Add a circlular memory indicator to the "clear all" button area (2/2)

Adds the option to show/hide the memory indicator around the clear
all recents button.
Also adds the option to always show the memory indicator, even if
the clear all recents button is not visible.

Patch Set 2 & 3:
Android Studio auto cleaned imports

Patch Set 4:
Disable always show indicator when show indicator is not checked

Patch Set 5:
Always show the indicator if it should be shown.
Also allow it to choose a custom location for the indicator.

Change-Id: If02666e084abe689a83afde3da33ccbdaa6c337a