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David Crawshaw 7deab368af app: ensure gl work is drained before endDraw
If a frame draw cycle does not end in a blocking GL call,
then the app package may process the <-endDraw before the
final <-gl.WorkAvailable, meaning some GL calls miss the
frame.

So we make sure the final GL call for a frame is blocking.

Fixes golang/go#11696.
Fixes golang/go#10688.

Change-Id: I39772a3308c98947b1f0838ad58d1d406a711e7f
Reviewed-on: https://go-review.googlesource.com/12123
Reviewed-by: Nigel Tao <nigeltao@golang.org>
2015-07-14 10:21:53 +00:00
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