Notify launcher page with onTransitionChanged event

chrome/browser/apps/custom_launcher_page_browsertest_views.cc

Index: chrome/browser/apps/custom_launcher_page_browsertest_views.cc
diff --git a/chrome/browser/apps/custom_launcher_page_browsertest_views.cc b/chrome/browser/apps/custom_launcher_page_browsertest_views.cc
index 534351c66d4f502d34c3abbcb2f72de775714b75..2e6f056a79ac4b7b440f40e8308d6cdf877dd203 100644
--- a/chrome/browser/apps/custom_launcher_page_browsertest_views.cc
+++ b/chrome/browser/apps/custom_launcher_page_browsertest_views.cc
@@ -7,9 +7,15 @@
 #include "base/command_line.h"
 #include "chrome/browser/apps/app_browsertest_util.h"
 #include "chrome/browser/ui/app_list/app_list_service.h"
+#include "chrome/browser/ui/app_list/app_list_service_views.h"
+#include "chrome/browser/ui/app_list/app_list_shower_views.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/switches.h"
+#include "extensions/test/extension_test_message_listener.h"
 #include "ui/app_list/app_list_switches.h"
+#include "ui/app_list/views/app_list_main_view.h"
+#include "ui/app_list/views/app_list_view.h"
+#include "ui/app_list/views/contents_view.h"
 
 namespace {
 
@@ -55,6 +61,34 @@ class CustomLauncherPageBrowserTest
   DISALLOW_COPY_AND_ASSIGN(CustomLauncherPageBrowserTest);
 };
 
-IN_PROC_BROWSER_TEST_F(CustomLauncherPageBrowserTest, LoadPageAndOpenLauncher) {
+IN_PROC_BROWSER_TEST_F(CustomLauncherPageBrowserTest,
+                       OpenLauncherAndSwitchToCustomPage) {
   LoadAndLaunchPlatformApp(kCustomLauncherPagePath, "Launched");
+
+  AppListServiceViews* service = static_cast<AppListServiceViews*>(
+      AppListService::Get(chrome::HOST_DESKTOP_TYPE_NATIVE));
+  // The app list should have loaded instantly since the profile is already
+  // loaded.
+  EXPECT_TRUE(service->IsAppListVisible());
+
+  app_list::ContentsView* contents_view =
+      service->shower().app_list()->app_list_main_view()->contents_view();
+
+  ASSERT_TRUE(
+      contents_view->IsStateActive(app_list::AppListModel::STATE_START));
+
+  {
+    ExtensionTestMessageListener listener("onPageExpanded", false);
+    contents_view->SetActivePage(contents_view->GetPageIndexForState(
+        app_list::AppListModel::STATE_CUSTOM_LAUNCHER_PAGE));
+
+    listener.WaitUntilSatisfied();
+  }
+  {
+    ExtensionTestMessageListener listener("onPageCollapsed", false);
+    contents_view->SetActivePage(contents_view->GetPageIndexForState(
+        app_list::AppListModel::STATE_START));
+
+    listener.WaitUntilSatisfied();
+  }
 }