Add override specifier and member constness to RecoveryUI classes.

Test: mmma bootable/recovery
Change-Id: I66e328614423488a4027d7878f4569fbf3a3721e
diff --git a/wear_ui.h b/wear_ui.h
index e228f9f..e108d4d 100644
--- a/wear_ui.h
+++ b/wear_ui.h
@@ -47,12 +47,11 @@
   // outer of window
   int outer_height, outer_width;
 
-  // Unusable rows when displaying the recovery menu, including the lines
-  // for headers (Android Recovery, build id and etc) and the bottom lines
-  // that may otherwise go out of the screen.
+  // Unusable rows when displaying the recovery menu, including the lines for headers (Android
+  // Recovery, build id and etc) and the bottom lines that may otherwise go out of the screen.
   int menu_unusable_rows;
 
-  int GetProgressBaseline() override;
+  int GetProgressBaseline() const override;
 
   bool InitTextParams() override;