Add AAC test to SoundPoolTest
- Change the original code to get file/resource names from member functions.
  (SoundPool is changed to abstract class)
- SoundPoolAacTest implements those functions to provide AAC clips
- SoundPoolOggTest for Ogg
- new aac clips in mp4 container added (converted from the original ogg)

Change-Id: I940da1117539ee89acb4aa17bb9760c7ed8563f8
8 files changed