[Sync] Add per-navigation timestamps/unique ids to tab sync.

chrome/browser/sync/glue/synced_session_tracker.h

Index: chrome/browser/sync/glue/synced_session_tracker.h
diff --git a/chrome/browser/sync/glue/synced_session_tracker.h b/chrome/browser/sync/glue/synced_session_tracker.h
index 8e402a78d9970068ee68cc852b541a973e01b889..955eb728488d4077fc1d333dce474db87b421487 100644
--- a/chrome/browser/sync/glue/synced_session_tracker.h
+++ b/chrome/browser/sync/glue/synced_session_tracker.h
@@ -20,7 +20,7 @@
 namespace browser_sync {
 
 // Class to manage synced sessions. The tracker will own all SyncedSession
-// and SessionTab objects it creates, and deletes them appropriately on
+// 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).
@@ -57,7 +57,7 @@ class SyncedSessionTracker {
   // - Returns false, tab is set to NULL.
   bool LookupSessionTab(const std::string& session_tag,
                         SessionID::id_type tab_id,
-                        const SessionTab** tab) const;
+                        const SyncedSessionTab** tab) const;
 
   // Returns a pointer to the SyncedSession object associated with
   // |session_tag|.  If none exists, creates one. Ownership of the
@@ -104,8 +104,8 @@ class SyncedSessionTracker {
   // Returns a pointer to the SessionTab object associated with |tab_id| for
   // the session specified with |session_tag|. If none exists, creates one.
   // Ownership of the SessionTab remains within the SyncedSessionTracker.
-  SessionTab* GetTab(const std::string& session_tag,
-                     SessionID::id_type tab_id);
+  SyncedSessionTab* GetTab(const std::string& session_tag,
+                           SessionID::id_type tab_id);
 
   // Free the memory for all dynamically allocated objects and clear the
   // tracking structures.
@@ -139,10 +139,10 @@ class SyncedSessionTracker {
   // above).
   struct SessionTabWrapper {
     SessionTabWrapper() : tab_ptr(NULL), owned(false) {}
-    SessionTabWrapper(SessionTab* tab_ptr, bool owned)
+    SessionTabWrapper(SyncedSessionTab* tab_ptr, bool owned)
         : tab_ptr(tab_ptr),
           owned(owned) {}
-    SessionTab* tab_ptr;
+    SyncedSessionTab* tab_ptr;
     bool owned;
   };
   typedef std::map<SessionID::id_type, SessionTabWrapper> IDToSessionTabMap;
@@ -185,7 +185,7 @@ class SyncedSessionTracker {
   // have not yet mapped to SyncedSessions. These are temporarily orphaned
   // tabs, and won't be deleted if we delete synced_session_map_, but are still
   // owned by the SyncedSessionTracker itself (and deleted on Clear()).
-  std::set<SessionTab*> unmapped_tabs_;
+  std::set<SyncedSessionTab*> unmapped_tabs_;
 
   // The tag for this machine's local session, so we can distinguish the foreign
   // sessions.