Do not submit: high level overview patch.

chrome/browser/sessions/base_session_service.h

Index: chrome/browser/sessions/base_session_service.h
diff --git a/chrome/browser/sessions/base_session_service.h b/chrome/browser/sessions/base_session_service.h
index 2e7b25809820a9ed1a022db44199c5f4073254b9..08cce7c99332a956741d2e0504c40080223546a6 100644
--- a/chrome/browser/sessions/base_session_service.h
+++ b/chrome/browser/sessions/base_session_service.h
@@ -113,6 +113,11 @@ class BaseSessionService : public CancelableRequestProvider {
       SessionID::id_type window_id,
       const std::string& app_name);
 
+  SessionCommand* CreateSetTabSessionSyncIdCommand(
+      SessionID::id_type command_id,
+      SessionID::id_type tab_id,
+      const int64& sync_id);
+
   // Converts a SessionCommand previously created by
   // CreateUpdateTabNavigationCommand into a
   // sessions::SerializedNavigationEntry. Returns true on success. If
@@ -144,6 +149,10 @@ class BaseSessionService : public CancelableRequestProvider {
       SessionID::id_type* window_id,
       std::string* app_name);
 
+  bool RestoreSetTabSessionSyncIdCommand(const SessionCommand& command,
+                                         SessionID::id_type* tab_id,
+                                         int64* sync_id);
+
   // Returns true if the entry at specified |url| should be written to disk.
   bool ShouldTrackEntry(const GURL& url);