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

core/cross/gles2/renderer_gles2.cc

Index: core/cross/gles2/renderer_gles2.cc
diff --git a/core/cross/gles2/renderer_gles2.cc b/core/cross/gles2/renderer_gles2.cc
index 71d5c725e343310379ce48d1cde93adadb00a06b..76a2b7f55ad2e00ea9055f8b94057e8de2298a8a 100644
--- a/core/cross/gles2/renderer_gles2.cc
+++ b/core/cross/gles2/renderer_gles2.cc
@@ -1205,7 +1205,13 @@ Renderer::InitStatus  RendererGLES2::InitPlatformSpecific(
     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);