expose api to count the number of ops in a picture

include/core/SkPicture.h

Index: include/core/SkPicture.h
diff --git a/include/core/SkPicture.h b/include/core/SkPicture.h
index 1e8b364145d7800cf02ecea87b0d1d78bcc7990a..69353cfe08ad6aa59fc71f2790d6aaba8ae66fe6 100644
--- a/include/core/SkPicture.h
+++ b/include/core/SkPicture.h
@@ -197,6 +197,14 @@ public:
     // Takes ref on listener.
     void addDeletionListener(DeletionListener* listener) const;
 
+    /**
+     *  Return the approximate number of "operations" in the picture. This number is hard to nail
+     *  down precisely, since there is not always a 1-to-1 correspondence between "operations" in
+     *  the internal format, and public API calls on SkCanvas. It is also possible that the value
+     *  returned may chage, as deferred optimizations may vary the count.
+     */
+    int countOps() const;
+
 private:
     // V2 : adds SkPixelRef's generation ID.
     // V3 : PictInfo tag at beginning, and EOF tag at the end