command_buffer_gles2: Avoid creating multiple AtExitManagers

gpu/gles2_conform_support/egl/egl.cc

Index: gpu/gles2_conform_support/egl/egl.cc
diff --git a/gpu/gles2_conform_support/egl/egl.cc b/gpu/gles2_conform_support/egl/egl.cc
index b439b1eb09866e2b6623837f8d349b909f02c9ef..d9899e08c64769536bd450a226b943176f65dd8c 100644
--- a/gpu/gles2_conform_support/egl/egl.cc
+++ b/gpu/gles2_conform_support/egl/egl.cc
@@ -148,6 +148,11 @@ EGLAPI EGLBoolean EGLAPIENTRY eglTerminate(EGLDisplay dpy) {
   egl::Display* display = static_cast<egl::Display*>(dpy);
   delete display;
 
+  // TODO: EGL specifies that the objects are marked for deletion and they will
+  // remain alive as long as "contexts or surfaces associated with display is
+  // current to any thread".
+  // Currently we delete the display here, and may also call exit handlers.
+
   return EglSuccess(EGL_TRUE);
 }