The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/bbbf0a551e8c9efa244c8171cc219859c303e539

commit bbbf0a551e8c9efa244c8171cc219859c303e539
Author: Michael Spang <spang@chromium.org>
Date: Wed Apr 25 22:06:29 2018

ozone: demo: Remove duplicate render frame in surfaceless mode

Since the surfaceless renderers inherit the surface renderers, we
actually initially post two tasks to render frame. This results in
tearing.

Remove the duplicate post. As a followup, this inheritance should
be removed since it is too error prone.

Bug:  836971 
Test: ozone_demo on eve
Change-Id: If79edf65f6aba2cc239f0e349860d6b56ba82450
Reviewed-on: https://chromium-review.googlesource.com/1028844
Reviewed-by: Albert Chaulk <achaulk@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553782}
[modify] https://crrev.com/bbbf0a551e8c9efa244c8171cc219859c303e539/ui/ozone/demo/skia/skia_surfaceless_gl_renderer.cc
[modify] https://crrev.com/bbbf0a551e8c9efa244c8171cc219859c303e539/ui/ozone/demo/surfaceless_gl_renderer.cc

 Issue 833453  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/756d113826bd190b6d8b75c2367aacc04756bf52

commit 756d113826bd190b6d8b75c2367aacc04756bf52
Author: Michael Spang <spang@chromium.org>
Date: Thu Apr 26 17:50:25 2018

ozone: demo: Don't inherit GlRenderer from SurfacelessGlRenderer

Using inheritance risks operations leaking into the other type of
surface, or being duplicated, as in  bug 836971 . There really isn't much
code to share, so untangle these classes by just copying the common
parts.

Bug:  836971 
Test: ozone_demo on eve
Change-Id: I952dd8e8e3284a1713ec39ec4371f230c3ddb8d7
Reviewed-on: https://chromium-review.googlesource.com/1028983
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554074}
[modify] https://crrev.com/756d113826bd190b6d8b75c2367aacc04756bf52/ui/ozone/demo/gl_renderer.h
[modify] https://crrev.com/756d113826bd190b6d8b75c2367aacc04756bf52/ui/ozone/demo/surfaceless_gl_renderer.cc
[modify] https://crrev.com/756d113826bd190b6d8b75c2367aacc04756bf52/ui/ozone/demo/surfaceless_gl_renderer.h