am ad98d383: Support for communicating if a buffer read from the _extractor_ is a sync sample or not.

Merge commit 'ad98d383a04fce08a147b200e23b12f12b2681a3' into gingerbread-plus-aosp

* commit 'ad98d383a04fce08a147b200e23b12f12b2681a3':
  Support for communicating if a buffer read from the _extractor_ is a sync sample or not.