Neil Roberts 67a095b9dd Cache the debug wireframe snippet
When rendering the debug wireframe Cogl generates a child pipeline of
the application's pipeline to replace the fragment processing.
Previously it was creating a new snippet every time something was
drawn. Cogl doesn't attempt to compare the contents of snippets when
looking in the program cache for a matching pipeline so this would
cause it to generate a new program for every primitive. It then quite
quickly ends printing the warning about there being more than 50
programs in the cache. To fix that this patch makes it cache the
snippet so that Cogl can successfully recognise that it already has a
program generated for the new pipeline.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit c4bb08ee8767b5320980dba10b20921393cb5613)
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