Detect sync server communication errors

chrome/browser/sync/sessions/sync_session.cc

Index: chrome/browser/sync/sessions/sync_session.cc
diff --git a/chrome/browser/sync/sessions/sync_session.cc b/chrome/browser/sync/sessions/sync_session.cc
index 064fef6744e9d753fbb4b2e58975646e16ab9190..79d576f3cdaeb5caa893058a42c1c4a45f1725eb 100644
--- a/chrome/browser/sync/sessions/sync_session.cc
+++ b/chrome/browser/sync/sessions/sync_session.cc
@@ -233,6 +233,26 @@ std::set<ModelSafeGroup>
   return enabled_groups_with_verified_updates;
 }
 
+namespace {
+// Return true if the command in question was attempted and did not complete
+// successfully.
+//
+bool IsError(SyncerError error) {
+  return error != UNSET && error != SYNCER_OK;
+}
+}  // namespace
+
+bool SyncSession::Succeeded() const {
+  const bool download_updates_error =
+      IsError(status_controller_->error().last_download_updates_result);
+  const bool post_commit_error =
+      IsError(status_controller_->error().last_post_commit_result);
+  const bool process_commit_response_error =
+      IsError(status_controller_->error().last_process_commit_response_result);
+  return !download_updates_error
+      && !post_commit_error
+      && !process_commit_response_error;
+}
 
 }  // namespace sessions
 }  // namespace browser_sync