Allow scroll events to open custom launcher pages.

ui/app_list/views/start_page_view.h

Index: ui/app_list/views/start_page_view.h
diff --git a/ui/app_list/views/start_page_view.h b/ui/app_list/views/start_page_view.h
index 0022229e33e51bc852b6069ee6c084656cf71b43..36a00ac7336dcce1fc65c6840162ae67a07ed364 100644
--- a/ui/app_list/views/start_page_view.h
+++ b/ui/app_list/views/start_page_view.h
@@ -30,26 +30,25 @@ class APP_LIST_EXPORT StartPageView : public views::View {
 
   void UpdateForTesting();
 
+  void OpenCustomLauncherPage();
+
   const std::vector<SearchResultTileItemView*>& tile_views() const;
   TileItemView* all_apps_button() const;
 
   // Called when the start page view is displayed.
   void OnShow();
 
-  // Called when the start page view is hidden (while the app list is still
-  // open).
-  void OnHide();
-
   // Overridden from views::View:
   void Layout() override;
   bool OnKeyPressed(const ui::KeyEvent& event) override;
 
+  bool OnMousePressed(const ui::MouseEvent& event) override;
+  bool OnMouseWheel(const ui::MouseWheelEvent& event) override;
+  void OnGestureEvent(ui::GestureEvent* event) override;
+
   // Returns search box bounds to use when the start page is active.
   gfx::Rect GetSearchBoxBounds() const;
 
-  // Updates whether the custom page clickzone is visible.
-  void UpdateCustomPageClickzoneVisibility();
-
  private:
   class StartPageTilesContainer;