[Sync] - In about:sync page display if the first sync after restart has taken place or not.

chrome/browser/sync/sessions/session_state.h

 // Copyright (c) 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.
 
 // The 'sessions' namespace comprises all the pieces of state that are
 // combined to form a SyncSession instance. In that way, it can be thought of
 // as an extension of the SyncSession type itself. Session scoping gives
 // context to things like "conflict progress", "update progress", etc, and the
 // separation this file provides allows clients to only include the parts they
 // need rather than the entire session stack.
@@ skipping 104 matching lines @@
     const std::string
         (&download_progress_markers)[syncable::MODEL_TYPE_COUNT]);
 
 // An immutable snapshot of state from a SyncSession.  Convenient to use as
 // part of notifications as it is inherently thread-safe.
 struct SyncSessionSnapshot {
   SyncSessionSnapshot(
       const SyncerStatus& syncer_status,
       const ErrorCounters& errors,
       int64 num_server_changes_remaining,
-      bool is_share_usable,
       syncable::ModelTypeSet initial_sync_ended,
       const std::string
           (&download_progress_markers)[syncable::MODEL_TYPE_COUNT],
       bool more_to_sync,
       bool is_silenced,
       int64 unsynced_count,
       int num_blocking_conflicting_updates,
       int num_conflicting_updates,
       bool did_commit_items,
       const SyncSourceInfo& source,
       size_t num_entries,
       base::Time sync_start_time,
       bool retry_scheduled);
   ~SyncSessionSnapshot();
 
   // Caller takes ownership of the returned dictionary.
   base::DictionaryValue* ToValue() const;
 
   std::string ToString() const;
 
   const SyncerStatus syncer_status;
   const ErrorCounters errors;
   const int64 num_server_changes_remaining;
-  const bool is_share_usable;
   const syncable::ModelTypeSet initial_sync_ended;
   const std::string download_progress_markers[syncable::MODEL_TYPE_COUNT];
   const bool has_more_to_sync;
   const bool is_silenced;
   const int64 unsynced_count;
   const int num_blocking_conflicting_updates;
   const int num_conflicting_updates;
   const bool did_commit_items;
   const SyncSourceInfo source;
   const size_t num_entries;
@@ skipping 167 matching lines @@
   ~PerModelSafeGroupState();
 
   UpdateProgress update_progress;
   ConflictProgress conflict_progress;
 };
 
 }  // namespace sessions
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_SESSIONS_SESSION_STATE_H_