SoundRecorder: Add support for Pause/Resume in AMR-WB tunnel mode on SoundRecorder

- Stopping AudioSource will be implemented when Pausing the SoundRecorder. However, it
  will be redone when stopping the SoundRecorder which will cause the exception.
- When it stays at Pause state, avoid to redo Stopping AudioSource

Change-Id: I2aeddd1ce4e3366660012b39241546ee305667fb
libstagefright: Fix for FPS drop issue during A-V playback.

Issues:
-The AAC decoder was not updating the timestamp when EOS is reached.
-Logic to smoothen the real time update in AudioPlayer uses system
 time. This introduces corrupt timestamp during EOS.

Fix:
-Update the timestamp in AAC decoder when EOS is reached.
-Extrapolate realtime using system time in AudioPlayer when EOS is
 reached. Cap the value to realtime if  extrapolated time becomes
 greater than realtime.

CRs-Fixed: 384183 515066
Change-Id: Ice54501436431d2527fcd3d710d65d9732fcffdd