Notify launcher page with onTransitionChanged event

chrome/browser/ui/app_list/launcher_page_event_dispatcher_views.h

Index: chrome/browser/ui/app_list/launcher_page_event_dispatcher_views.h
diff --git a/chrome/browser/ui/app_list/launcher_page_event_dispatcher_views.h b/chrome/browser/ui/app_list/launcher_page_event_dispatcher_views.h
new file mode 100644
index 0000000000000000000000000000000000000000..ac44647165d72ac516c7822f6e2527077b392290
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+++ b/chrome/browser/ui/app_list/launcher_page_event_dispatcher_views.h
@@ -0,0 +1,54 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_UI_APP_LIST_LAUNCHER_PAGE_EVENT_DISPATCHER_VIEWS_H_
+#define CHROME_BROWSER_UI_APP_LIST_LAUNCHER_PAGE_EVENT_DISPATCHER_VIEWS_H_
+
+#include "base/basictypes.h"
+#include "chrome/browser/ui/host_desktop.h"
+#include "ui/app_list/pagination_model_observer.h"
+#include "ui/app_list/views/app_list_main_view.h"
+
+namespace base {
+class ListValue;
+}
+
+namespace app_list {
+
+class AppListMainView;
+
+// A class which observes the app list and sends events to the custom launcher
+// page.
+class LauncherPageEventDispatcherViews : public PaginationModelObserver,
+                                         public AppListMainViewObserver {
+ public:
+  LauncherPageEventDispatcherViews(chrome::HostDesktopType host_desktop,
+                                   Profile* profile,
+                                   const std::string& extension_id);
+  ~LauncherPageEventDispatcherViews() override;
+
+  // Overridden from PaginationModelObserver:
+  void SelectedPageChanged(int old_selected, int new_selected) override;
+  void TransitionStarted() override;
+  void TransitionChanged() override;
+
+  // Overridden from AppListMainViewObserver:
+  void OnContentsViewCreated() override;
+  void OnContentsViewDestroying() override;
+
+ private:
+  void SendEventToLauncherPage(const std::string& event_name,
+                               scoped_ptr<base::ListValue> args);
+
+  Profile* profile_;
+  std::string extension_id_;
+
+  AppListMainView* main_view_;
+
+  DISALLOW_COPY_AND_ASSIGN(LauncherPageEventDispatcherViews);
+};
+
+}  // namespace app_list
+
+#endif  // CHROME_BROWSER_UI_APP_LIST_LAUNCHER_PAGE_EVENT_DISPATCHER_VIEWS_H_