allow move/zero-line/close to draw caps

include/core/SkPath.h

Index: include/core/SkPath.h
diff --git a/include/core/SkPath.h b/include/core/SkPath.h
index e1bc5e4d856d3fa0ff2bdc46a90362c698058781..8df7633d425f063a415884271685e0a1913feb59 100644
--- a/include/core/SkPath.h
+++ b/include/core/SkPath.h
@@ -1143,6 +1143,10 @@ private:
     bool isRectContour(bool allowPartial, int* currVerb, const SkPoint** pts,
                        bool* isClosed, Direction* direction) const;
 
+    // called by stroker to see if all points are equal and worthy of a cap
+    // equivalent to a short-circuit version of getBounds().isEmpty() 
+    bool isZeroLength() const;
+
     /** Returns if the path can return a bound at no cost (true) or will have to
         perform some computation (false).
      */