Move taskgroup initialization closer to where it is used

This makes the vtune and instruments charts easier to understand/read.

Change-Id: I0469b723699d174681f9e36b5ff12f7e9c3d1d34
Reviewed-on: https://skia-review.googlesource.com/136607
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed