Preapre region tracking in layers

Change-Id: Ied1fa0d36c99ef4e33cb8fde7e3106a793db3a4c
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
index 8cec8f1..56be134 100644
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -145,6 +145,8 @@
     virtual void dirtyLayer(const float left, const float top,
             const float right, const float bottom);
 
+    void dirtyLayerUnchecked(Rect& bounds, Region* region);
+
 private:
     /**
      * Saves the current state of the renderer as a new snapshot.