James Dong d036662470 Make MediaWriter stop and pause return errors if necessary
o Make the API consistent with SF framework, which the MediaSource
  provides a return status for stop

o Also, helps to convey errors that occurred right when a
  premature stop() is called, leading to a potentially
  mal-formed output file.

Change-Id: I52a932345f38570fdf8ea04d67d73dd94ccd30ef
2010-08-19 13:33:13 -07:00
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