cts: add testH263_adaptiveDrc

Also add test clip, which is generated with ffmpeg-2.3.1:
./ffmpeg -i video_1280x720_mp4_h264_1000kbps_25fps_aac_stereo_128kbps_44100hz.mp4 -strict -2 -codec:v h263 -f 3gp -s 352x288 -r 12 -b:v 300k -codec:a aac -b:a 128k -ar 22050 video_352x288_3gp_h263_300kbps_12fps_aac_stereo_128kbps_22050hz.3gp

Bug: 17326758
Change-Id: I0b08a5731f741a9a9b836b0c07db98fcdd0cedde