Implement sidebar support for extension action popups

chrome/browser/extensions/sidebar_manager.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_MANAGER_H_
+#define CHROME_BROWSER_EXTENSIONS_SIDEBAR_MANAGER_H_
+
+#include "base/observer_list.h"
+#include "chrome/browser/extensions/sidebar_container.h"
+
+class GURL;
+class SidebarContainer;
+class SidebarManagerObserver;
+
+namespace content {
+class BrowserContext;
+class WebContents;
+}
+
+namespace extensions {
+
+// Singleton that manages SidebarContainer instances and
+// maintains a connection between tabs and sidebars.
+class SidebarManager {
+ public:
+  // Returns SidebarManager instance registered with BrowserContext.
+  static SidebarManager* GetFromContext(content::BrowserContext* context);
+
+  SidebarManager();
+
+  ~SidebarManager();
+
+  // Returns SidebarContainer registered for |tab| or nullptr if there is no
+  // SidebarContainer registered for |tab|.
+  SidebarContainer* GetSidebarContainerFor(content::WebContents* tab);
+
+  // Creates a new sidebar identified by |tab| (adds sidebar's mini tab).
+  void CreateSidebar(content::WebContents* tab,
+                     const GURL& url,
+                     Browser* browser);
+
+  // Hides and destroys sidebar identified by |tab| (removes sidebar's mini
+  // tab).

[Devlin, 2015/07/07 21:39:29]

What is a mini tab?

[ltilve, 2015/07/09 22:15:51]

Done. Removed the wrong comment.

+  void HideSidebar(content::WebContents* tab);

[Devlin, 2015/07/07 21:39:29]

Let's rename this HideSidebarForTab().

[ltilve, 2015/07/09 22:15:51]

Done.

+
+  void AddObserver(SidebarManagerObserver* observer);
+  void RemoveObserver(SidebarManagerObserver* observer);
+
+ private:
+  // These two maps are for tracking dependencies between tabs and
+  // their SidebarContainers.
+  //
+  // SidebarManager start listening to SidebarContainers when they are put
+  // into these maps and removes them when they are closing.
+  using TabToSidebarContainerMap =
+      std::map<content::WebContents*, SidebarContainer*>;
+
+  TabToSidebarContainerMap tab_to_sidebar_container_;
+
+  base::ObserverList<SidebarManagerObserver> observer_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(SidebarManager);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_SIDEBAR_MANAGER_H_