Updates to the Android.mk writer.

Keeping up with changes made to the Android.mk file that is
currently checked in.

R=djsollen@google.com, epoger@google.com

Author: scroggo@google.com

Review URL: https://codereview.chromium.org/183953002

git-svn-id: http://skia.googlecode.com/svn/trunk@13626 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed