struct VideoFrame

Core codec representation of a video frame. Different core codecs may have

very different implementations of this.

TODO(dustingreen): Have this be a base class that's defined by the

CodecImpl source_set, and have amlogic-video VideoFrame derive from that base

class.

Regardless of codec, these will be managed by shared_ptr

<

>, because for

decoder reference frames, shared_ptr

<

> makes sense.