Also enables running video_capture_tests_apk on the WebRTC/Chromium APK bots, assuming GYP_DEFINES includes include_tests=1 and include_internal_video_capture=1. This required running VideoCaptureAndroid's camera capture on a dedicated thread, matching other platform's video_capture impls. BUG=2974,3152 R=wu@webrtc.org Review URL: https://webrtc-codereview.appspot.com/11359004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@5868 4adac7df-926f-26a2-2b94-8c16560cd09d