Add OzoneGLImpl interface.

ui/ozone/common/gl_ozone_egl.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_OZONE_PUBLIC_GL_OZONE_EGL_H_
+#define UI_OZONE_PUBLIC_GL_OZONE_EGL_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "ui/gl/gl_implementation.h"
+#include "ui/ozone/public/gl_ozone.h"
+
+namespace ui {
+
+// A partial implementation of GLOzone for EGL.
+class GLOzoneEGL : public GLOzone {
+ public:
+  GLOzoneEGL() {}
+  ~GLOzoneEGL() override {}
+
+  // GLOzone:
+  bool InitializeGLOneOffPlatform() override;
+  bool InitializeStaticGLBindings(gl::GLImplementation implementation) override;
+  void InitializeDebugGLBindings() override;
+  void ClearGLBindings() override;
+  bool GetGLWindowSystemBindingInfo(
+      gl::GLWindowSystemBindingInfo* info) override;
+  scoped_refptr<gl::GLContext> CreateGLContext(
+      gl::GLShareGroup* share_group,
+      gl::GLSurface* compatible_surface,
+      gl::GpuPreference gpu_preference) override;
+  scoped_refptr<gl::GLSurface> CreateViewGLSurface(
+      gfx::AcceleratedWidget window) override = 0;
+  scoped_refptr<gl::GLSurface> CreateSurfacelessViewGLSurface(
+      gfx::AcceleratedWidget window) override;
+  scoped_refptr<gl::GLSurface> CreateOffscreenGLSurface(
+      const gfx::Size& size) override = 0;
+
+ protected:
+  // Returns native platform display handle. This is used to obtain the EGL
+  // display connection for the native display.
+  virtual intptr_t GetNativeDisplay() = 0;
+
+  // Sets up GL bindings for the native surface.
+  virtual bool LoadGLES2Bindings() = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(GLOzoneEGL);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PUBLIC_GL_OZONE_EGL_H_