This patch allows us to automatically detect whether ctts box is needed in MPEG4Writer.
MPEG4Writer uses ctts version 0 (non-negative offset value) store the composition time
offset on a needed basis.
Currently, the size of the ctts box is not optimized. Optimization will be addressed
in a subsequent patch.
o also changed the private method retrieveDecodingTime(bool) in OMXCodec
to getDecodingTime()
o related-to-bug: 4232183
Change-Id: Ic6dc7b25ecd258c2506ca4b9c25156e922456e51
7251673821