Remove C++11 related warning

Change-Id: I250ff7bd0ea49908e11b14c995d77312cd09a8b4
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
index c5e4c8e..f165581 100644
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -366,6 +366,13 @@
 
 private:
     /**
+     * Discards the content of the framebuffer if supported by the driver.
+     * This method should be called at the beginning of a frame to optimize
+     * rendering on some tiler architectures.
+     */
+    void discardFramebuffer(float left, float top, float right, float bottom);
+
+    /**
      * Ensures the state of the renderer is the same as the state of
      * the GL context.
      */