./examples/widget_gallery/widget_gallery
libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast
X Error of failed request: GLXBadContext
Major opcode of failed request: 154 (GLX)
Minor opcode of failed request: 6 (X_GLXIsDirect)
Serial number of failed request: 36
Current serial number in output stream: 35
This seems to indicate you have no functional OpenGL driver (or SkUI is doing things wrong or in a way incompatible with your driver stack).
What's your glxinfo output?