Workaround for open source drivers.
Workaround for open source drivers.

On current open source drivers (1.9.2.901 intel and radeon pulled from X-edgers PPA), glXGetFBConfigFromVisualSGIX is not working as expected even though glxinfo lists GLX_SGIX_fbconfig as a supported extension. Rather than abort when this function fails, this simple patch tries the second code path provided when glXGetFBConfigFromVisualSGIX is unsupported.

BUG=none
TEST=by hand on Linux with 3D CSS

Review URL: http://codereview.chromium.org/6969002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@84653 0039d316-1c4b-4281-b951-d872f2087c98

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