Your Native Client plugin is not enabled! i set my native client to enable by chrome://flags same done whit NaCl and stil cant run arcane legends on my ubuntu stats on chrome://gpu Graphics Feature Status
Canvas: Hardware accelerated
Compositing: Hardware accelerated
3D CSS: Hardware accelerated
CSS Animation: Accelerated
WebGL: Hardware accelerated
WebGL multisampling: Hardware accelerated
Flash 3D: Hardware accelerated
Flash Stage3D: Hardware accelerated
Flash Stage3D Baseline profile: Hardware accelerated
Texture Sharing: Hardware accelerated
Video Decode: Hardware accelerated
Video: Hardware accelerated
Panel Fitting: Unavailable. Hardware acceleration disabled.
Rasterization: Software only. Hardware acceleration disabled.