[Bug 741425] debugutils: Add a gst_debug_bin_to_dot_data() method

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=741425
  GStreamer | gst-plugins-bad | unspecified

--- Comment #4 from Arun Raghavan <arun at accosted.net> 2014-12-12 09:30:34 UTC ---
I separated the two paths as a bit of a premature micro-optimisation (so we
don't allocate a bunch of potentially large string buffers for the
write-to-file case).

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