Update the ic_grabber drawable with a holo version

Replaces the old gingerbread drawable with one that better
fits the holo design language. Also adds an xhdpi drawable.

Change-Id: I4365f7184f236c6e916015413f9a4f122b8e743c
Merge "Update the ic_grabber drawable with a holo version" into cm-10.1
Merge remote branch 'cm/cm-10.1'