Implement sidebar support for extension action popups

chrome/browser/extensions/sidebar_manager.h

+// Copyright (c) 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 <map>
+#include <string>

[Devlin, 2015/06/19 19:56:10]

Do we need this?

[ltilve, 2015/06/28 22:44:20]

Done.

+
+#include "base/observer_list.h"
+#include "base/strings/string16.h"

[Devlin, 2015/06/19 19:56:10]

Or this?

[ltilve, 2015/06/28 22:44:20]

Done.

+#include "chrome/browser/extensions/sidebar_container.h"

[Devlin, 2015/06/19 19:56:10]

Or this? (Please comb through these regularly and remove what you don't need -
this goes for the rest of the patch)

[ltilve, 2015/06/28 22:44:20]

Done.

+
+class GURL;
+class SidebarContainer;
+class SidebarManagerObserver;
+
+namespace content {
+class BrowserContext;
+class WebContents;
+}
+
+namespace extensions {
+///////////////////////////////////////////////////////////////////////////////
+// SidebarManager
+//
+//  This class is a 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();
+
+  // Returns SidebarContainer registered for |tab| or nullptr if there is no

[Devlin, 2015/06/19 19:56:10]

It seems like this and HasSidebar can be combined (doesn't null from this ==
HasSidebar() returning false?)

[ltilve, 2015/06/28 22:44:20]

By combining them I understand that you mean just removing the bool function,
and use the null check instead in all the cases. Is that correct? 

[ltilve, 2015/06/29 10:46:51]

Done. I have applied that modification.

+  // 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).
+  void HideSidebar(content::WebContents* tab);
+
+  // Check if |tab| has a sidebar assigned.
+  bool HasSidebar(content::WebContents* tab);
+
+  void AddObserver(SidebarManagerObserver* observer);
+  void RemoveObserver(SidebarManagerObserver* observer);
+
+  ~SidebarManager();

[Devlin, 2015/06/19 19:56:10]

put this up near the constructor

[ltilve, 2015/06/28 22:44:20]

Done.

+
+ private:
+  // Returns SidebarContainer corresponding to |sidebar_contents|.
+  SidebarContainer* FindSidebarContainerFor(

[Devlin, 2015/06/19 19:56:10]

Is this used?

[ltilve, 2015/06/28 22:44:20]

Done. This function has been moved to the UI patch set
https://codereview.chromium.org/1169823005/, where it is being used.

+      content::WebContents* sidebar_contents);
+
+  // This map stores sidebars linked to a particular tab. Sidebars are
+  // identified by their unique content id (string).
+  typedef std::map<std::string, SidebarContainer*>
+      ContentIdToSidebarContainerMap;

[Devlin, 2015/06/19 19:56:10]

Do we need this?

[ltilve, 2015/06/28 22:44:20]

Done. It was not being longer used.

+
+  // 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.
+  typedef std::map<content::WebContents*, SidebarContainer*>

[Devlin, 2015/06/19 19:56:10]

nit: prefer 'using' syntax.

[ltilve, 2015/06/28 22:44:20]

Done.

+      TabToSidebarContainerMap;
+  TabToSidebarContainerMap tab_to_sidebar_container_;
+
+  base::ObserverList<SidebarManagerObserver> observer_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(SidebarManager);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_SIDEBAR_MANAGER_H_