[Sync] Componentize synced_tab_delegate

chrome/browser/sync/glue/synced_session_tracker.h

 // Copyright 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_SYNC_GLUE_SYNCED_SESSION_TRACKER_H_
 #define CHROME_BROWSER_SYNC_GLUE_SYNCED_SESSION_TRACKER_H_
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "components/sessions/core/session_id.h"
 #include "components/sessions/core/session_types.h"
 #include "components/sync_driver/glue/synced_session.h"
 #include "components/sync_driver/tab_node_pool.h"
 
+namespace sync_sessions {
+class SyncSessionsClient;
+}
+
 namespace browser_sync {
 
 // Class to manage synced sessions. The tracker will own all SyncedSession
 // and SyncedSessionTab objects it creates, and deletes them appropriately on
 // destruction.
 // Note: SyncedSession objects are created for all synced sessions, including
 // the local session (whose tag we maintain separately).
 class SyncedSessionTracker {
  public:
-  SyncedSessionTracker();
+  explicit SyncedSessionTracker(
+      sync_sessions::SyncSessionsClient* sessions_client);
   ~SyncedSessionTracker();
 
   // We track and distinguish the local session from foreign sessions.
   void SetLocalSessionTag(const std::string& local_session_tag);
 
   // Fill a preallocated vector with all foreign sessions we're tracking (skips
   // the local session object). SyncedSession ownership remains within the
   // SyncedSessionTracker.
   // Returns true if we had foreign sessions to fill it with, false otherwise.
   bool LookupAllForeignSessions(
@@ skipping 177 matching lines @@
 
   // Helper methods for deleting SessionWindows and SessionTabs without owners.
   bool DeleteOldSessionWindowIfNecessary(SessionWindowWrapper window_wrapper);
   bool DeleteOldSessionTabIfNecessary(SessionTabWrapper tab_wrapper);
 
   // Implementation for GetTab(...) above, permits invalid tab_node_id.
   sessions::SessionTab* GetTabImpl(const std::string& session_tag,
                                    SessionID::id_type tab_id,
                                    int tab_node_id);
 
+  // The client of the sync sessions datatype.
+  sync_sessions::SyncSessionsClient* const sessions_client_;
+
   // Per client mapping of tab id's to their SessionTab objects.
   // Key: session tag.
   // Value: Tab id to SessionTabWrapper map.
   SyncedTabMap synced_tab_map_;
 
   // Per client mapping of the window id's to their SessionWindow objects.
   // Key: session_tag
   // Value: Window id to SessionWindowWrapper map.
   SyncedWindowMap synced_window_map_;
 
@@ skipping 11 matching lines @@
   // The tag for this machine's local session, so we can distinguish the foreign
   // sessions.
   std::string local_session_tag_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncedSessionTracker);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_SYNCED_SESSION_TRACKER_H_