Squashed commit of the following:

commit 3bbaa29066a684d01df42ddf0365266e59f2dc44
Author: Ying Wang <wangying@google.com>
Date:   Tue Apr 9 22:00:43 2013 -0700

    Add liblog

    Bug: 8580410
    Change-Id: Iebcce1382c5727afcaaf79cecca51947036dbf65

Change-Id: I999494d28a8246505584ee092ebfddc1d8e4a637