frame/texture: use dividers when allocating buffers

Allows render pipeline to know the "real" and "simulated" resolution of a
divided buffer.

app/codec/decoder.cpp

@@ -57,7 +57,7 @@ void Decoder::set_stream(StreamPtr fs)
   stream_ = fs;
 }
 
-FramePtr Decoder::RetrieveVideo(const rational &/*timecode*/, const int &/*divider*/)
+FramePtr Decoder::RetrieveVideo(const rational &/*timecode*/, const int &/*divider*/, bool /*use_proxies*/)
 {
   return nullptr;
 }