Enable creation of offscreen contexts which own their backing surface.

ui/gl/init/gl_factory_ozone.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gl/init/gl_factory.h"
 
 #include "base/logging.h"
 #include "base/trace_event/trace_event.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_context_egl.h"
@@ skipping 128 matching lines @@
 
   if (HasDefaultImplementation(GetGLImplementation()))
     return CreateDefaultOffscreenGLSurface(size);
 
   // TODO(kylechar): This is deprecated and can be removed once all Ozone
   // platforms use GLOzone instead.
   return GetSurfaceFactoryOzone()->CreateOffscreenGLSurface(
       GetGLImplementation(), size);
 }
 
+scoped_refptr<GLSurface> CreateUninitializedOffscreenGLSurface(
+    const gfx::Size& size) {
+  return CreateOffscreenGLSurface(size);

[piman, 2016/11/16 00:44:03]

That will return an initialized surface, and it will be incorrect to call
Initialize on it again.

[klausw, 2017/01/05 02:17:43]

Moot, now using CreateOffscreenGLSurfaceWithFormat.

+}
+
 }  // namespace init
 }  // namespace gl