Detect sync server communication errors

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 87 matching lines @@
   // commit.
   int consecutive_transient_error_commits;
 
   // Incremented when get_updates fails, commit fails, and when hitting
   // transient errors. When any of these succeed, this counter is reset.
   // TODO(chron): Reduce number of weird counters we use.
   int consecutive_errors;
 
   // Any protocol errors that we received during this sync session.
   SyncProtocolError sync_protocol_error;
+
+  // Records the most recent results of PostCommit and GetUpdates commands.
+  SyncerError last_download_updates_result;
+  SyncerError last_post_commit_result;
+  SyncerError last_process_commit_response_result;
 };
 
 // Caller takes ownership of the returned dictionary.
 base::DictionaryValue* DownloadProgressMarkersToValue(
     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 {
@@ skipping 217 matching lines @@
   ~PerModelSafeGroupState();
 
   UpdateProgress update_progress;
   ConflictProgress conflict_progress;
 };
 
 }  // namespace sessions
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_SESSIONS_SESSION_STATE_H_