Add audio_e2e_test target to tools.gyp

The moving this GYP target out of webrtc.gyp in
https://code.google.com/p/webrtc/source/detail?r=4949
this should have been added into tools.gyp.

TEST=trybots passing
BUG=none
TBR=andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2539004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5002 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed