help with render spu

Hello all,

I am a newbie to Chromium. I went through a bit of chromium code, and
understood how SPUs are loaded. Now I want to understand render spu in
detail. Is there some documentation available with any one of you
which gives -

[1] A high level description of what render spu is supposed to do.
[2] Details of what function in code of render spu implements what.

If you could point out some sequence that I should follow while
browsing the code of render spu, that would be great.

-- 
Thanks,
Aditya Kulkarni


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