Fix non-uniform scale and stroked ellipses

Fix non-uniform scale and stroked ellipses

Strokes were not being scaled properly for ellipses -- the
view matrix was being reset before the scale factors were
being applied. Scaling the stroke has been moved up higher in
the process. Also applies some optimizations suggested by
robertphillips.

R=robertphillips@google.com

Author: jvanverth@google.com

Review URL: https://chromiumcodereview.appspot.com/14017012

git-svn-id: http://skia.googlecode.com/svn/trunk@8777 2bbb7eff-a529-9590-31e7-b0007b416f81