Add information about sync session and other useful data to about:sync.

chrome/browser/sync/sessions/session_state.h

 // Copyright (c) 2011 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 109 matching lines @@
       bool is_share_usable,
       const syncable::ModelTypeBitSet& 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);
+      const SyncSourceInfo& source,
+      size_t num_entries);
   ~SyncSessionSnapshot();
 
   // Caller takes ownership of the returned dictionary.
   DictionaryValue* ToValue() const;
 
   const SyncerStatus syncer_status;
   const ErrorCounters errors;
   const int64 num_server_changes_remaining;
   const bool is_share_usable;
   const syncable::ModelTypeBitSet 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;
 };
 
 // Tracks progress of conflicts and their resolution using conflict sets.
 class ConflictProgress {
  public:
   explicit ConflictProgress(bool* dirty_flag);
   ~ConflictProgress();
   // Various iterators, size, and retrieval functions for conflict sets.
   IdToConflictSetMap::const_iterator IdToConflictSetBegin() const;
   IdToConflictSetMap::const_iterator IdToConflictSetEnd() const;
@@ skipping 164 matching lines @@
   ~PerModelSafeGroupState();
 
   UpdateProgress update_progress;
   ConflictProgress conflict_progress;
 };
 
 }  // namespace sessions
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_SESSIONS_SESSION_STATE_H_