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

ui/app_list/app_list_model.cc

Index: ui/app_list/app_list_model.cc
diff --git a/ui/app_list/app_list_model.cc b/ui/app_list/app_list_model.cc
index 491087ec18c90447625f11ce35a4d7addc46d4e6..0a8e0cd33bfc5b8b006eb65fd62d4dbaf375cb41 100644
--- a/ui/app_list/app_list_model.cc
+++ b/ui/app_list/app_list_model.cc
@@ -20,7 +20,8 @@ AppListModel::AppListModel()
       status_(STATUS_NORMAL),
       state_(INVALID_STATE),
       folders_enabled_(false),
-      custom_launcher_page_enabled_(true) {
+      custom_launcher_page_enabled_(true),
+      search_engine_is_google_(false) {
   top_level_item_list_->AddObserver(this);
 }
 
@@ -347,6 +348,12 @@ void AppListModel::ClearCustomLauncherPageSubpages() {
   custom_launcher_page_subpage_depth_ = 0;
 }
 
+void AppListModel::SetSearchEngineIsGoogle(bool is_google) {
+  search_engine_is_google_ = is_google;
+  FOR_EACH_OBSERVER(AppListModelObserver, observers_,
+                    OnSearchEngineIsGoogleChanged(is_google));
+}
+
 // Private methods
 
 void AppListModel::OnListItemMoved(size_t from_index,