Hum, here is what I get whith chrome://gpu :
Graphics Feature Status
Canvas: Hardware accelerated
Flash: Hardware accelerated
Flash Stage3D: Hardware accelerated
Flash Stage3D Baseline profile: Hardware accelerated
Compositing: Hardware accelerated
Multiple Raster Threads: Disabled
Out-of-process Rasterization: Disabled
Hardware Protected Video Decode: Unavailable
Rasterization: Software only. Hardware acceleration disabled
Skia Renderer: Disabled
Video Decode: Unavailable
Viz Display Compositor: Enabled
Viz Hit-test Surface Layer: Disabled
WebGL: Hardware accelerated
WebGL2: Hardware accelerated
Obviously there is something wrong, but I wouldn't know where to start. Do you have some idea?