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

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

Index: ios/chrome/browser/ui/ntp/recent_tabs/synced_sessions.h
diff --git a/ios/chrome/browser/ui/ntp/recent_tabs/synced_sessions.h b/ios/chrome/browser/ui/ntp/recent_tabs/synced_sessions.h
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+// 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_SYNCED_SESSIONS_H_
+#define IOS_CHROME_BROWSER_UI_NTP_RECENT_TABS_SYNCED_SESSIONS_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/strings/string16.h"
+#include "base/time/time.h"
+#include "components/sessions/core/session_id.h"
+#include "components/sync_sessions/synced_session.h"
+#include "url/gurl.h"
+
+namespace syncer {
+class SyncService;
+}
+
+namespace sync_sessions {
+class OpenTabsUIDelegate;
+}
+
+namespace synced_sessions {
+
+// Data holder that contains the data of the distant tabs to show in the UI.
+struct DistantTab {
+  DistantTab();
+  // Uniquely identifies the distant session this DistantTab belongs to.
+  std::string session_tag;
+  // Uniquely identifies this tab in its distant session.
+  SessionID::id_type tab_id;
+  // The title of the page shown in this DistantTab.
+  base::string16 title;
+  // The url shown in this DistantTab.
+  GURL virtual_url;
+  // Returns a hash the fields |virtual_url| and |title|.
+  // By design, two tabs in the same distant session can have the same
+  // |hashOfUserVisibleProperties|.
+  size_t hashOfUserVisibleProperties();
+
+  DISALLOW_COPY_AND_ASSIGN(DistantTab);
+};
+
+// Data holder that contains the data of the distant sessions and their tabs to
+// show in the UI.
+
+class DistantSession {
+ public:
+  DistantSession();
+  // Initialize with the session tagged with |tag| and obtained with
+  // |sync_service|. |sync_service| must not be null.
+  DistantSession(syncer::SyncService* sync_service, const std::string& tag);
+  ~DistantSession();
+  void InitWithSyncedSession(const sync_sessions::SyncedSession* synced_session,
+                             sync_sessions::OpenTabsUIDelegate* open_tabs);
+  std::string tag;
+  std::string name;
+  base::Time modified_time;
+  sync_sessions::SyncedSession::DeviceType device_type;
+  std::vector<std::unique_ptr<DistantTab>> tabs;
+
+  DISALLOW_COPY_AND_ASSIGN(DistantSession);
+};
+
+// Class containing distant sessions.
+class SyncedSessions {
+ public:
+  // Initialize with no distant sessions.
+  SyncedSessions();
+  // Initialize with all the distant sessions obtained from |sync_service|.
+  // |sync_service| must not be null.
+  explicit SyncedSessions(syncer::SyncService* sync_service);
+  SyncedSessions(syncer::SyncService* sync_service, const std::string& tag);
+  ~SyncedSessions();
+  DistantSession const* GetSession(size_t index) const;
+  DistantSession const* GetSessionWithTag(const std::string& tag) const;
+  size_t GetSessionCount() const;
+  void EraseSession(size_t index);
+
+  // Used by tests only.
+  void AddDistantSessionForTest(
+      std::unique_ptr<const DistantSession> distant_session);
+
+ private:
+  std::vector<std::unique_ptr<const DistantSession>> sessions_;
+
+  DISALLOW_COPY_AND_ASSIGN(SyncedSessions);
+};
+
+}  // namespace synced_sessions
+
+#endif  // IOS_CHROME_BROWSER_UI_NTP_RECENT_TABS_SYNCED_SESSIONS_H_