GPU implementation of drawRegion()

include/gpu/GrDrawContext.h

Index: include/gpu/GrDrawContext.h
diff --git a/include/gpu/GrDrawContext.h b/include/gpu/GrDrawContext.h
index 993bb56f9efc4e936a4f0860dfafa4ddc47ee57e..777421d18d195787bffdde117e293f5d4c522239 100644
--- a/include/gpu/GrDrawContext.h
+++ b/include/gpu/GrDrawContext.h
@@ -216,7 +216,19 @@ public:
                    const SkRSXform xform[],
                    const SkRect texRect[],
                    const SkColor colors[]);
-    
+
+    /**
+     * Draws a region.
+     *
+     * @param paint         describes how to color pixels
+     * @param viewMatrix    transformation matrix
+     * @param region        the region to be drawn
+     */
+    void drawRegion(const GrClip&,
+                    const GrPaint& paint,
+                    const SkMatrix& viewMatrix,
+                    const SkRegion& region);
+
     /**
      * Draws an oval.
      *