SkPath::rewind needs to have same reset as SkPath::reset.

src/core/SkPath.cpp

Index: src/core/SkPath.cpp
===================================================================
--- src/core/SkPath.cpp	(revision 9658)
+++ src/core/SkPath.cpp	(working copy)
@@ -425,8 +425,9 @@
 
     SkPathRef::Rewind(&fPathRef);
     GEN_ID_INC;
+    fBoundsIsDirty = true;

[reed1, 2013/06/19 12:30:10]

Would be nice if we have a shared resetFields() helper method to encapsulate
this, maybe.

     fConvexity = kUnknown_Convexity;
-    fBoundsIsDirty = true;
+    fDirection = kUnknown_Direction;
     fSegmentMask = 0;
     fLastMoveToIndex = INITIAL_LASTMOVETOINDEX_VALUE;
     fIsOval = false;