Support chrome.windows extension API events for browserless Panels.

chrome/browser/extensions/extension_panel_event_router.h

+// Copyright (c) 2012 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_EXTENSION_PANEL_EVENT_ROUTER_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_PANEL_EVENT_ROUTER_H_
+
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+class Panel;
+class Profile;
+
+// The ExtensinoPanelEventRouter listens to Panel window events
+// and routes them to listeners inside extension process renderers.
+class ExtensionPanelEventRouter : public content::NotificationObserver {
+ public:
+  explicit ExtensionPanelEventRouter(Profile* profile);
+  virtual ~ExtensionPanelEventRouter();
+
+  // Must be called once. Subsequent calls have no effect.
+  void Init();
+
+  // content::NotificationObserver.
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+ private:
+  void OnPanelOpened(Panel* panel);
+  void OnPanelActiveStatusChanged(Panel* panel, bool is_active_now);
+  void OnPanelClosed(Panel* panel);
+
+  content::NotificationRegistrar registrar_;
+
+  bool initialized_;
+
+  // The main profile that owns this event router.
+  Profile* profile_;
+
+  // The profile the currently focused panel belongs to; either the main or
+  // incognito profile or NULL (none of the above). We remember this in order
+  // to correctly handle focus changes between non-OTR and OTR panels.
+  Profile* focused_profile_;
+
+  // The currently focused panel. We keep this so as to avoid sending multiple
+  // windows.onFocusChanged events with the same windowId.
+  int focused_window_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionPanelEventRouter);
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PANEL_EVENT_ROUTER_H_