Add a skeleton Start Page to the experimental app list.

ui/app_list/views/start_page_view.h

Index: ui/app_list/views/start_page_view.h
diff --git a/ui/app_list/views/start_page_view.h b/ui/app_list/views/start_page_view.h
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+++ b/ui/app_list/views/start_page_view.h
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+// 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 app_list {
+
+class AppListMainView;
+
+// The start page for the experimental app list.
+class StartPageView : public views::View, public views::ButtonListener {
+ public:
+  StartPageView(AppListMainView* app_list_main_view,
+                content::WebContents* start_page_web_contents);
+  virtual ~StartPageView();
+
+  void Reset();
+
+ private:
+  // 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.
+  views::View* items_container_;         // Owned by views hierarchy.
+
+  DISALLOW_COPY_AND_ASSIGN(StartPageView);
+};
+
+}  // namespace app_list
+
+#endif  // UI_APP_LIST_VIEWS_START_PAGE_VIEW_H_