community/chromium: fix WebGL support
Without these, Chromium will not support WebGL, and will fall back to software.
Included are reports from chrome://gpu before and after this change. (note the error log in before complaining about 'Failed to load /usr/lib/chromium/libGLESv2.so: Error loading shared library /usr/lib/chromium/libGLESv2.so: No such file or directory'