o3d: create a gles v2 context for the native gles2 backend

core/cross/gles2/renderer_gles2.cc

 /*
  * Copyright 2009, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 1187 matching lines @@
   DLOG(INFO) << "Depth: " << depth_size << " bits, Stencil:" << stencil_size
              << "bits";
 
   EGLSurface egl_surface = eglCreateWindowSurface(egl_display, config,
                                                   window, NULL);
   if (!egl_surface) {
     DLOG(ERROR) << "eglCreateWindowSurface failed.";
     return INITIALIZATION_ERROR;
   }
 
-  EGLContext egl_context = eglCreateContext(egl_display, config, NULL, NULL);
+  static const EGLint egl_context_attributes[] = {
+    EGL_CONTEXT_CLIENT_VERSION, 2,
+    EGL_NONE
+  };
+
+  EGLContext egl_context = eglCreateContext(egl_display, config, NULL,
+                                            egl_context_attributes);
   if (!egl_context) {
     DLOG(ERROR) << "eglCreateContext failed.";
     eglDestroySurface(egl_display, egl_surface);
     return INITIALIZATION_ERROR;
   }
 
   display_ = display;
   window_ = window;
   egl_display_ = egl_display;
   egl_surface_ = egl_surface;
@@ skipping 545 matching lines @@
   return swizzle_table;
 }
 
 // This is a factory function for creating Renderer objects.  Since
 // we're implementing GLES2, we only ever return a GLES2 renderer.
 Renderer* Renderer::CreateDefaultRenderer(ServiceLocator* service_locator) {
   return RendererGLES2::CreateDefault(service_locator);
 }
 
 }  // namespace o3d