gapk: add optional throttling

When throttling is enabled, one voice frame will be processed every
20ms.  This is useful for e.g. playback of a file as a RTP stream.

Without this option, the entire file would generate a flood of RTP
messages, rather than a continuous stream.

Change-Id: I0dcd4248cc800b82142722aa36a811f0657b3e0c
1 file changed