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

ios/chrome/browser/ui/ntp/recent_tabs/synced_sessions_bridge.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 IOS_CHROME_BROWSER_UI_NTP_RECENT_TABS_SYNCED_SESSIONS_BRIDGE_H_
+#define IOS_CHROME_BROWSER_UI_NTP_RECENT_TABS_SYNCED_SESSIONS_BRIDGE_H_
+
+#import <UIKit/UIKit.h>
+
+#import "base/ios/weak_nsobject.h"
+#include "components/signin/core/browser/signin_manager_base.h"
+#include "components/sync/driver/sync_service_observer.h"
+#import "ios/chrome/browser/sync/sync_observer_bridge.h"
+#import "ios/chrome/browser/ui/ntp/recent_tabs/synced_sessions_bridge.h"
+
+namespace ios {
+class ChromeBrowserState;
+}
+class SigninManager;
+
+@class RecentTabsPanelController;
+
+@protocol SyncedSessionsObserver<SyncObserverModelBridge>
+- (void)reloadSessions;
+@end
+
+namespace synced_sessions {
+
+// Bridge class that will notify the panel when the remote sessions content
+// change.
+class SyncedSessionsObserverBridge : public SyncObserverBridge,
+                                     public SigninManagerBase::Observer {
+ public:
+  SyncedSessionsObserverBridge(id<SyncedSessionsObserver> owner,
+                               ios::ChromeBrowserState* browserState);
+  ~SyncedSessionsObserverBridge() override;
+  // SyncObserverBridge implementation.
+  void OnStateChanged() override;
+  void OnSyncCycleCompleted() override;
+  void OnSyncConfigurationCompleted() override;
+  void OnForeignSessionUpdated() override;
+  // SigninManagerBase::Observer implementation.
+  void GoogleSignedOut(const std::string& account_id,
+                       const std::string& username) override;
+  // Returns true if the first sync cycle that contains session information is
+  // completed. Returns false otherwise.
+  bool IsFirstSyncCycleCompleted();
+
+ private:
+  base::WeakNSProtocol<id<SyncedSessionsObserver>> owner_;
+  SigninManager* signin_manager_;
+  syncer::SyncService* sync_service_;
+  ScopedObserver<SigninManagerBase, SigninManagerBase::Observer>
+      signin_manager_observer_;
+  // Stores whether the first sync cycle that contains session information is
+  // completed.
+  bool first_sync_cycle_is_completed_;
+};
+
+}  // namespace synced_sessions
+
+#endif  // IOS_CHROME_BROWSER_UI_NTP_RECENT_TABS_SYNCED_SESSIONS_BRIDGE_H_