am eff30e3d: Change the default time scale for audio/video track during recording and reduce rounding errors in calculating the sample duration

Merge commit 'eff30e3d1b005fd0696390d1dd47ec4ff0c52784' into gingerbread-plus-aosp

* commit 'eff30e3d1b005fd0696390d1dd47ec4ff0c52784':
  Change the default time scale for audio/video track during recording
tree: 94b5887059eabda7d8fabe686eba50f5c7963f94
  1. camera/
  2. cmds/
  3. include/
  4. media/
  5. services/