Add OzoneGLImpl interface.

ui/gl/init/ozone_util.h

+// 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.
+
+#ifndef UI_GL_INIT_OZONE_UTIL_H_
+#define UI_GL_INIT_OZONE_UTIL_H_
+
+#include "base/macros.h"
+#include "ui/gl/gl_implementation.h"
+#include "ui/ozone/public/gl_ozone.h"
+#include "ui/ozone/public/ozone_platform.h"
+#include "ui/ozone/public/surface_factory_ozone.h"
+
+namespace gl {
+namespace init {
+
+inline ui::SurfaceFactoryOzone* GetSurfaceFactoryOzone() {
+  return ui::OzonePlatform::GetInstance()->GetSurfaceFactoryOzone();
+}
+
+// Returns true if there is an GLOzone for the specified GL implementation.
+inline bool HasGLOzone(GLImplementation impl) {
+  return GetSurfaceFactoryOzone()->GetGLOzone(impl) != nullptr;
+}
+
+// Returns true if there is an GLOzone for the set GL implementation.
+inline bool HasGLOzone() {
+  return HasGLOzone(GetGLImplementation());
+}
+
+// Returns the GLOzone for the specified GL implementation or null if none
+// exists.
+inline ui::GLOzone* GetGLOzone(GLImplementation impl) {
+  return GetSurfaceFactoryOzone()->GetGLOzone(impl);
+}
+
+// Returns the GLOzone for the set GL implementation or null if none exists.
+inline ui::GLOzone* GetGLOzone() {
+  return GetGLOzone(GetGLImplementation());
+}
+
+}  // namespace init
+}  // namespace gl
+
+#endif  // UI_GL_INIT_OZONE_UTIL_H_