Add a skeleton Start Page to the experimental app list.

ui/app_list/views/start_page_view.h

+// 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 UI_APP_LIST_VIEWS_START_PAGE_VIEW_H_
+#define UI_APP_LIST_VIEWS_START_PAGE_VIEW_H_
+
+#include "base/basictypes.h"
+#include "ui/views/controls/button/button.h"
+#include "ui/views/view.h"
+
+namespace content {
+class WebContents;
+}
+
+namespace views {
+class BoundsAnimator;
+}
+
+namespace app_list {
+
+class AppListMainView;
+
+// The start page for the experimental app list.
+class StartPageView : public views::View,
+                      public views::ButtonListener {
+ public:
+  explicit StartPageView(AppListMainView* app_list_main_view,

[xiyuan, 2014/03/14 17:00:54]

nit: explicit is not needed.

[calamity, 2014/05/07 06:11:52]

Done.

+                         content::WebContents* start_page_web_contents);
+  virtual ~StartPageView();
+
+ private:
+  // Overridden from views::View:
+  virtual void Layout() OVERRIDE;
+
+  // Overridden from views::ButtonListener:
+  virtual void ButtonPressed(views::Button* sender,
+                             const ui::Event& event) OVERRIDE;
+
+  AppListMainView* app_list_main_view_;  // Owned by views hierarchy.
+  views::View* instant_container_;  // Owned by views hierarchy.
+
+  DISALLOW_COPY_AND_ASSIGN(StartPageView);
+};
+
+}  // namespace app_list
+
+#endif  // UI_APP_LIST_VIEWS_START_PAGE_VIEW_H_