Add root_path_android.cc to webrtc/test/Android.mk.

Fixes the broken android-platform build (build that uses .mk files).

TBR=andrew@webrtc.org,henrike@webrtc.org
BUG=

Review URL: https://webrtc-codereview.appspot.com/1777004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4314 4adac7df-926f-26a2-2b94-8c16560cd09d
4 files changed