Add {Lock,Unlock,Show,Hide}Cursor() to the window manager mojom.

ash/aura/shell_port_classic.h

Index: ash/aura/shell_port_classic.h
diff --git a/ash/aura/shell_port_classic.h b/ash/aura/shell_port_classic.h
index cdf3098075d5899c5470d0998cf52538c20d7993..ba4eebe1a200f424cc03abbf27178c951b178a99 100644
--- a/ash/aura/shell_port_classic.h
+++ b/ash/aura/shell_port_classic.h
@@ -47,6 +47,9 @@ class ASH_EXPORT ShellPortClassic : public ShellPort,
                                 const gfx::Insets& insets) override;
   void LockCursor() override;
   void UnlockCursor() override;
+  void ShowCursor() override;
+  void HideCursor() override;
+  void SetGlobalOverrideCursor(base::Optional<ui::CursorData> cursor) override;
   bool IsMouseEventsEnabled() override;
   std::vector<WmWindow*> GetAllRootWindows() override;
   void RecordGestureAction(GestureActionType action) override;