The answer here will help a little with this question: How do I browse a site that uses WebGL?
But to have WebGL support you need:
Video Card that supports OpenGL ES 2.0 which is the base for WebGL. If your video card supports OpenGL 2.0+ then you already have OpenGL ES 2.0 support and so WebGL will work fine although I recommend video cards that support OpenGL 3.0+ since it is more close to the time that OpenGL ES 2.0 came out.
Browser that supports WebGL. For the time being, the best Desktop browsers for this are Google Chrome and Firefox. I am a Firefox users but i have to say that, up to Firefox 10, Chrome still has better support for WebGL. In renders faster. More FPS in general.
Since Firefox 4.x and Chrome 9 you have support for WebGL. Not very good but at least it has support. This was a long time ago. Right now there is Firefox 10 and Chrome 17. Both of which have superior support for WebGL.
You can select the Stable, Beta or Dev version you want from Chrome here: http://dev.chromium.org/getting-involved/dev-channel
You can select the Beta or Dev version you want from Firefox here: https://launchpad.net/~mozillateam/+archive/firefox-next
For what I have seen the Radeon Xpress 200M has support for OpenGL 2.0. The chipset RC410 mentions support for OpenGL 2.0. So you should be fine there. There is also no need to add command line parameters to Chrome or Firefox. Just install the latest (Firefox 10+ or Chrome 17+) and done.
For the drivers I do recommend using the proprietary drivers from the Additional Drivers application. Just open Dash and type
Drivers. That should show you the Additional Drivers app.