Improve performance of extruded sketch centroid calculations
completed by: Andromeda Galaxy
This is a follow-on task to https://www.google-melange.com/gci/task/view/google/gci2014/5297789445603328
The objective of this task is to reduce the runtime for calculating an extruded sketch centroid by at least 20%.
Submit a patch file with changes that improve performance.References: