minor fixes to cubics code and overall alignment of how bounds and tops are computed for all curve types

All but 17 extended tests work.

A helper function is privately added to SkPath.h to permit a test to modify a given point in a path.

BUG=skia:3588

Review URL: https://codereview.chromium.org/1107353004

1 files changed, 2 insertions, 0 deletions

diff --git a/include/core/SkPath.h b/include/core/SkPath.h
index b5b95e15e7..c413560102 100644
--- a/include/core/SkPath.h
+++ b/include/core/SkPath.h
@@ -1034,6 +1034,8 @@ private:
         ed.setBounds(rect);
     }
 
+    void setPt(int index, SkScalar x, SkScalar y);
+
     friend class SkAutoPathBoundsUpdate;
     friend class SkAutoDisableOvalCheck;
     friend class SkAutoDisableDirectionCheck;