WebGL conformance test

- Current version is 1.0.0-r2 released 02/17/2012 at revision 16903.
  https://cvs.khronos.org/svn/repos/registry/trunk/public/webgl/sdk/tests/

To update test binaries:

0) Find revision number on page above (here 16903).
1) cd scripts
2) ./make_tarball 16903
3) Update revision number in graphics_WebGLConformance.py (tarball and patch).
4) Rename patch version and check if it is still working, otherwise manual three way merge.
5) Copy webgl-conformance-1.0.0-r2.tar.bz2 to 
   https://sandbox.google.com/storage/?arg=chromeos-localmirror/&pli=1#chromeos-localmirror%2Fdistfiles
   Make sure to go to the last page, select the uploaded binary and check "share publicly".