Fix shelf auto-hide calculation for app-list visibility.

ash/mus/app_list_presenter_mus.h

Index: ash/mus/app_list_presenter_mus.h
diff --git a/ash/mus/app_list_presenter_mus.h b/ash/mus/app_list_presenter_mus.h
index 2ed64ee8cc20e0aa7a466974c4104c1bf199e4d3..3205936a3e004518de8f4722435a76956df05f70 100644
--- a/ash/mus/app_list_presenter_mus.h
+++ b/ash/mus/app_list_presenter_mus.h
@@ -26,8 +26,10 @@ class AppListPresenterMus : public app_list::AppListPresenter {
   void Show(int64_t display_id) override;
   void Dismiss() override;
   void ToggleAppList(int64_t display_id) override;
-  bool IsVisible() const override;
-  bool GetTargetVisibility() const override;
+  bool IsVisible(
+      int64_t display_id = display::kInvalidDisplayId) const override;

[James Cook, 2016/11/30 23:27:19]

I don't think you're allowed to use default parameters on virtual functions.

https://google.github.io/styleguide/cppguide.html#Default_Arguments

+  bool GetTargetVisibility(
+      int64_t display_id = display::kInvalidDisplayId) const override;
 
  private:
   // Connect to the app list service in chrome if the connection hasn't