Even before that change, I don't see any code that automatically reconstructs construct quads from pairs of triangles. But maybe I'm missing something?

(I've been working on OpenGL platform translation for years)

Reconstructing quads from pairs of triangles is just about doable in a one-liner. The harder part in my opinion is applying texture mapping to the resulting triangle, but it's not unreasonably difficult.

    // this depends on your winding
    triangles = [1, 2, 4, 2, 3, 4]
    quads = []
    for i in xrange(len(triangles), 6):
        t = triangles[i:i+6]
        quads += [t[0], t[1], t[4], t[2]]

The only things I think are interesting here are their heuristics on shaders to apply color maps, and the fact they shipped a game with it.

No, you're right, there's no quad reconstruction. I imagine you could have just used quads in both the WebGL and Canvas renderers to achieve a similar effect.