Hide experimental app list Google logo and custom launcher page when search engine is not Google.

ui/app_list/app_list_model.h

Index: ui/app_list/app_list_model.h
diff --git a/ui/app_list/app_list_model.h b/ui/app_list/app_list_model.h
index edaf20e7366d594162c82ab0d93f3b4fb7c691a6..56e349c4bbe86048a7f6755900047ffc95937e6d 100644
--- a/ui/app_list/app_list_model.h
+++ b/ui/app_list/app_list_model.h
@@ -131,7 +131,9 @@ class APP_LIST_EXPORT AppListModel : public AppListItemListObserver {
 
   // Sets whether or not the custom launcher page should be enabled.
   void SetCustomLauncherPageEnabled(bool enabled);
-  bool custom_launcher_page_enabled() { return custom_launcher_page_enabled_; }
+  bool custom_launcher_page_enabled() const {
+    return custom_launcher_page_enabled_;
+  }
 
   // Pushes a custom launcher page's subpage into the state stack in the model.
   void PushCustomLauncherPageSubpage();
@@ -147,6 +149,9 @@ class APP_LIST_EXPORT AppListModel : public AppListItemListObserver {
     return custom_launcher_page_subpage_depth_;
   }
 
+  void SetSearchEngineIsGoogle(bool is_google);
+  bool search_engine_is_google() const { return search_engine_is_google_; }
+
   // Filters the given |results| by |display_type|. The returned list is
   // truncated to |max_results|.
   static std::vector<SearchResult*> FilterSearchResultsByDisplayType(
@@ -203,6 +208,7 @@ class APP_LIST_EXPORT AppListModel : public AppListItemListObserver {
   ObserverList<AppListModelObserver, true> observers_;
   bool folders_enabled_;
   bool custom_launcher_page_enabled_;
+  bool search_engine_is_google_;
 
   // The current number of subpages the custom launcher page has pushed.
   int custom_launcher_page_subpage_depth_;