typefindelement: Propagate input buffer PTS and DTS
typefindelement: Propagate input buffer PTS and DTS

The initial buffers (that were used for timestamping) might have PTS
and DTS set. In order to forward those properly, get the initial
PTS/DTS from the adapter and set them on the reconstructed output
buffer.

https://bugzilla.gnome.org/show_bug.cgi?id=733291

jpakkane/gstreamer,krichter722/gstreamer,mparis/gstreamer,jpxiong/gstreamer,mparis/gstreamer,mparis/gstreamer,StreamUtils/gstreamer,jpakkane/gstreamer,StreamUtils/gstreamer,jpakkane/gstreamer,centricular/gstreamer,krichter722/gstreamer,krichter722/gstreamer,jpxiong/gstreamer,jpxiong/gstreamer,centricular/gstreamer,shelsonjava/gstreamer,surround-io/gstreamer,jpakkane/gstreamer,StreamUtils/gstreamer,shelsonjava/gstreamer,shelsonjava/gstreamer,jpakkane/gstreamer,surround-io/gstreamer,StreamUtils/gstreamer,mparis/gstreamer,centricular/gstreamer,surround-io/gstreamer,surround-io/gstreamer,jpxiong/gstreamer,StreamUtils/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,shelsonjava/gstreamer,surround-io/gstreamer,centricular/gstreamer,mparis/gstreamer,krichter722/gstreamer,centricular/gstreamer,jpxiong/gstreamer