Upstream Chrome on iOS source code [6/11].

ios/chrome/browser/ui/ntp/recent_tabs/recent_tabs_bridges.h

+// 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 IOS_CHROME_BROWSER_UI_NTP_RECENT_TABS_RECENT_TABS_BRIDGES_H_
+#define IOS_CHROME_BROWSER_UI_NTP_RECENT_TABS_RECENT_TABS_BRIDGES_H_
+
+#import <UIKit/UIKit.h>
+
+#import "base/ios/weak_nsobject.h"
+#include "base/macros.h"
+#include "components/sessions/core/tab_restore_service_observer.h"
+
+@class RecentTabsPanelController;
+
+namespace recent_tabs {
+
+// Bridge class to forward events from the sessions::TabRestoreService to
+// Objective-C class RecentTabsPanelController.
+class ClosedTabsObserverBridge : public sessions::TabRestoreServiceObserver {
+ public:
+  explicit ClosedTabsObserverBridge(RecentTabsPanelController* owner);
+  ~ClosedTabsObserverBridge() override;
+
+  // sessions::TabRestoreServiceObserver implementation.
+  void TabRestoreServiceChanged(sessions::TabRestoreService* service) override;
+  void TabRestoreServiceDestroyed(
+      sessions::TabRestoreService* service) override;
+
+ private:
+  base::WeakNSObject<RecentTabsPanelController> owner_;
+
+  DISALLOW_COPY_AND_ASSIGN(ClosedTabsObserverBridge);
+};
+
+}  // namespace recent_tabs
+
+#endif  // IOS_CHROME_BROWSER_UI_NTP_RECENT_TABS_RECENT_TABS_BRIDGES_H_