Enable WebRTC demo application on x86 Android

Steps to build the demo application for x86 Android:
source build/android/envsetup.sh --target-arch=x86
gclient runhooks
ninja -C out/Debug
cd webrtc/video_engine/test/android
ndk-build APP_ABI=x86
ant debug

R=fischman@webrtc.org, leozwang@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1478004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4053 4adac7df-926f-26a2-2b94-8c16560cd09d
4 files changed