Make canvas pass rrects along to clip stack

include/core/SkRRect.h

Index: include/core/SkRRect.h
diff --git a/include/core/SkRRect.h b/include/core/SkRRect.h
index 66c433f43b8de831acc73be583ed0a9c5dc7bd50..e70cff6db9a5ea80f49af4057be1b2aff65dbe12 100644
--- a/include/core/SkRRect.h
+++ b/include/core/SkRRect.h
@@ -26,15 +26,9 @@ class SkMatrix;
 //      use growToInclude to fit skp round rects & generate stats (RRs vs. real paths)
 //      check on # of rectorus's the RRs could handle
 //   rendering work
-//      add entry points (clipRRect, drawRRect) - plumb down to SkBaseDevice
-//      update SkPath.addRRect() to take an SkRRect - only use quads
-//          -- alternatively add addRRectToPath here
+//      update SkPath.addRRect() to only use quads
 //      add GM and bench
-//   clipping opt
-//      update SkClipStack to perform logic with RRs
 //   further out
-//      add RR rendering shader to Ganesh (akin to cicle drawing code)
-//          - only for simple RRs
 //      detect and triangulate RRectorii rather than falling back to SW in Ganesh
 //