Enable creation of offscreen contexts which own their backing surface.

ui/gl/init/gl_factory_ozone.cc

Index: ui/gl/init/gl_factory_ozone.cc
diff --git a/ui/gl/init/gl_factory_ozone.cc b/ui/gl/init/gl_factory_ozone.cc
index ef3cb9a0872f885d0271a606d7725faa68368c56..2da35e04fff0dbfd19f3dafa3723d2046b5d4d0f 100644
--- a/ui/gl/init/gl_factory_ozone.cc
+++ b/ui/gl/init/gl_factory_ozone.cc
@@ -146,5 +146,10 @@ scoped_refptr<GLSurface> CreateOffscreenGLSurface(const gfx::Size& size) {
       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