This endeavor became real thanks to Sam Magnuson from Netflix, who did a lot of the work with me, and helped test and optimize it with a real-world application on TV hardware. also it was his idea and I stole it :)
Working across companies in the context of an open source project made a huge difference - they got better user experience for their application, and we got a QtWebkit feature that's functioning much better in a productized context.
WebKit/WebKitTools/Scripts/build-webkit --qt --qmakearg="CONFIG+=texmap"
Most of the code resides under WebCore/platform/graphics/texmap, and the OpenGL implementation is under WebCore/platform/graphics/opengl.