Implement sidebar support for extension action popups

chrome/browser/extensions/sidebar_container.h

+// Copyright 2015 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_EXTENSIONS_SIDEBAR_CONTAINER_H_
+#define CHROME_BROWSER_EXTENSIONS_SIDEBAR_CONTAINER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "base/scoped_observer.h"
+#include "chrome/browser/extensions/extension_view_host.h"
+#include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "extensions/browser/extension_host_observer.h"
+
+class Browser;
+
+namespace content {
+class WebContents;
+}
+
+namespace extensions {
+
+// Stores one particular sidebar state: sidebar's content, its content id,
+// tab it is linked to, mini tab icon, title etc.
+class SidebarContainer : public content::NotificationObserver,
+                         public TabStripModelObserver {
+ public:
+  SidebarContainer(Browser* browser,
+                   content::WebContents* tab,
+                   const GURL& url);
+  ~SidebarContainer() override;
+
+  // Returns HostContents sidebar is linked to.
+  content::WebContents* sidebar_contents() const {
+    return host_->host_contents();
+  }
+
+  // Returns TabContents sidebar is linked to.
+  content::WebContents* tab_contents() const { return tab_; }
+
+  const std::string& extension_id() { return host_->extension_id(); }
+
+  // TabStripModelObserver
+  void TabClosingAt(TabStripModel* tab_strip_model,
+                    content::WebContents* contents,
+                    int index) override;
+
+ private:
+  // content::NotificationObserver
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
+
+  scoped_ptr<extensions::ExtensionViewHost> host_;
+
+  content::NotificationRegistrar registrar_;
+
+  // Contents of the tab this sidebar is linked to.
+  content::WebContents* tab_;
+
+  // Reference to browser
+  Browser* browser_;
+
+  ScopedObserver<TabStripModel, TabStripModelObserver>
+      tab_strip_model_observer_;
+
+  DISALLOW_COPY_AND_ASSIGN(SidebarContainer);
+};
+
+}  // namespace extensions
+#endif  // CHROME_BROWSER_EXTENSIONS_SIDEBAR_CONTAINER_H_