Understanding Chromium graphics stack

[saikishore]

HI

i am very new to chroimum os and trying to build for own OEM and bringup gpu  on chromium os. 

Please help me the architecture of gpu on chromium os and as per its software architecure it uses  x + graphics library.

On that basis i found linux graphics stack as below

Will  the chrome architecture of gpu be same ? 

and in wiki, gpu accelration for chromium is mentioned below

www.chromium.org/developers/design-documents/gpu-accelerated-compositing-in-chrome 

 But the above link completely tells about browser rendering using gpu. Will be the chroimus os gpu accelration and chrome browser gpu accelration is same? I am very confused. Please explain.

Also in one of mail chain i found that "Mesa" was used by default as open-gl api. If vendor has his own gpu then does he need to use his gpu driver instead of mesa? 

Please help me to understand all this!!

thanks

saikishore