WebGL Native Render Plugin

I have been working on experimenting with trying to port the native render plugin example to WebGL by including the source in the Assets/Plugins/WebGL folder. I have been able to get the project to build and deploy but it appears that Unity is not calling the UNITY_INTERFACE_API functions UnityPluginLoad or OnGraphicsDeviceEvent.

Has anyone been able to do native OpenGL rendering under the WebGL platform?

I received some confirmation from a friend of mine working at Unity that these callbacks are not yet implemented under the HTML 5 exporter. I have submitted a bug to the bug repository here: https://fogbugz.unity3d.com/default.asp?818729_054b0k87kc11etd9