ozone: Allow using swiftshader with --use-gl=swiftshader.

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_COMMON_GL_OZONE_EGL_H_
 #define UI_OZONE_COMMON_GL_OZONE_EGL_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "ui/gl/gl_implementation.h"
@@ skipping 24 matching lines @@
       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;
+  virtual bool LoadGLES2Bindings(gl::GLImplementation implementation) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GLOzoneEGL);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_COMMON_GL_OZONE_EGL_H_