Set the profiler's thread name at a central place

Set the profiler's thread name at a central place

This will automatically catch thread names in several of the
child processes we are after, and it also catches the name
for a webkcore thread.

r=rtenneti
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=109898

[ramant (doing other things), 2011-11-14 04:33:23]

lgtm

[jar (doing other things), 2011-11-14 05:31:34]

Looking for a rubber stamp on content cleanup (deleting two lines!) from
Jam/Ben/Sky/Darin/Avi or Brett.

Thanks in advance.

[sky, 2011-11-14 16:10:57]

LGTM