Add getClipStack method to lua SkCanvas

include/utils/SkLua.h

Index: include/utils/SkLua.h
diff --git a/include/utils/SkLua.h b/include/utils/SkLua.h
index c6097464ef3fa4bee86db3907b7ac121fa2cee79..f67502a2e83a0033ada6041b31f7337b8ee9549c 100644
--- a/include/utils/SkLua.h
+++ b/include/utils/SkLua.h
@@ -15,6 +15,7 @@
 struct lua_State;
 
 class SkCanvas;
+class SkClipStack;
 class SkMatrix;
 class SkPaint;
 class SkPath;
@@ -53,6 +54,7 @@ public:
     void pushPaint(const SkPaint&, const char tableKey[] = NULL);
     void pushPath(const SkPath&, const char tableKey[] = NULL);
     void pushCanvas(SkCanvas*, const char tableKey[] = NULL);
+    void pushClipStack(const SkClipStack&, const char tableKey[] = NULL);
 
 private:
     lua_State*  fL;