Preserve convex control point polygon in cubic->quadratic approximation

GM test modified, will require rebaselining.

Review URL: http://codereview.appspot.com/6355088/





git-svn-id: http://skia.googlecode.com/svn/trunk@4518 2bbb7eff-a529-9590-31e7-b0007b416f81
5 files changed