Make webrtc build with audio device java impl and add an option to enable it

BUG=
TEST=buildbots

This cl is to make audio device java implemenation build in webrtc, and add an
option in gyp so we can switch between opensl implementaiton and java
implementation.
Review URL: https://webrtc-codereview.appspot.com/801004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2783 4adac7df-926f-26a2-2b94-8c16560cd09d
9 files changed