[QT] WebGL can not make the frame buffer with the stencil buffer.
When initializing a framebuffer in OpenGL ES 2, we need to initialize the depth
and stencil buffers separately, as opposed to the combined depth-stencil buffer
we initialize for desktop GL.
This makes fast/canvas/webgl/context-attributes-depth-stencil-combination.html
work in OpenGL ES 2.
Patch by Huang Dongsung <firstname.lastname@example.org> on 2011-12-19
Reviewed by Noam Rosenthal.
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