[Chromium-dev] QT 4.0 (Windows) compatibility patch

[<dr...@bf...>]

The attached patch enhances compatibility with QT 4.0 on Windows. QT 
implements an abstraction of an OpenGL context in its QGLContext class.
To create a context QGLContext always calls wglCreateLayerContext() even 
though a call to wglCreateContext() would do. To account for this I 
changed the implementation of wglCreateLayirContext_prox() in 
opengl_stub/wgl.c such that it forwards the call to 
wglCreateContext_prox() if layerPlane == 0.

Michael