Add nine patch type to SkRRect.

include/core/SkRRect.h

Index: include/core/SkRRect.h
diff --git a/include/core/SkRRect.h b/include/core/SkRRect.h
index 9878b54fdc0019be255f3c18551b748cd9dce8aa..5223ae7072d4fbbe788d028e8202d564fb9a89f0 100644
--- a/include/core/SkRRect.h
+++ b/include/core/SkRRect.h
@@ -71,6 +71,14 @@ public:
         //!< the curves) nor a rect (i.e., both radii are non-zero)
         kSimple_Type,
 
+        //!< The RR is non-empty and the two left x radii are equal, the two top
+        //!< y radii are equal, and the same for the right and bottom but it is
+        //!< neither an rect, oval, nor a simple RR. It is called "nine patch"
+        //!< because the centers of the corner ellipses form an axis aligned
+        //!< rect with edges that divide the RR into an 9 rectangular patches:
+        //!< an interior patch, four edge patches, and four corner patches.
+        kNinePatch_Type,
+
         //!< A fully general (non-empty) RR. Some of the x and/or y radii are
         //!< different from the others and there must be one corner where
         //!< both radii are non-zero.
@@ -99,6 +107,7 @@ public:
     inline bool isSimpleCircular() const {
         return this->isSimple() && fRadii[0].fX == fRadii[0].fY;
     }
+    inline bool isNinePatch() const { return kNinePatch_Type == this->getType(); }
     inline bool isComplex() const { return kComplex_Type == this->getType(); }
 
     bool allCornersCircular() const;
@@ -161,6 +170,12 @@ public:
     void setRectXY(const SkRect& rect, SkScalar xRad, SkScalar yRad);
 
     /**
+     * Initialize the rr with one radius per-side.
+     */
+    void setNinePatch(const SkRect& rect, SkScalar leftRad, SkScalar topRad,
+                      SkScalar rightRad, SkScalar bottomRad);
+
+    /**
      * Initialize the RR with potentially different radii for all four corners.
      */
     void setRectRadii(const SkRect& rect, const SkVector radii[4]);