[Bug 751157] basetextoverlay: Pass down GstVideoOverlayComposition buffers from upstream, receive window size event

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751157

--- Comment #1 from Lubosz Sarnecki <lubosz at gmail.com> ---
Created attachment 305559
  --> https://bugzilla.gnome.org/attachment.cgi?id=305559&action=edit
Pass down overlay composition buffers from upstream

This patch allows chaining multiple textoverlay elements without losing the
OverlayComposition meta data.

It makes pipelines like this possible:

    gst-launch-1.0 videotestsrc ! \
      textoverlay text="text1" valignment="top" font-desc="sans bold 30" ! \
      textoverlay text="text2" halignment="right" font-desc="sans bold 30" ! \
      textoverlay text="text3" halignment="left" font-desc="sans bold 30" ! \
      glimagesink

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