Sync: Report unmatched unassociated node during optimistic bookmark association.

chrome/browser/sync/glue/bookmark_model_associator.cc

Index: chrome/browser/sync/glue/bookmark_model_associator.cc
diff --git a/chrome/browser/sync/glue/bookmark_model_associator.cc b/chrome/browser/sync/glue/bookmark_model_associator.cc
index 6caa161824457bfb0c7629fbca9d3ce01748dce2..6719e0d7ae61d9762f92f350845f00141d3a7a6a 100644
--- a/chrome/browser/sync/glue/bookmark_model_associator.cc
+++ b/chrome/browser/sync/glue/bookmark_model_associator.cc
@@ -863,6 +863,22 @@ syncer::SyncError BookmarkModelAssociator::BuildAssociationsOptimistic(
           context->IncrementSyncItemsDeleted(num);
           continue;
         }
+      } else {
+        // Existing sync node isn't associated. This is unexpected during
+        // optimistic association unless there the previous association failed
+        // to
+        // persist extern IDs (that might be the case because persisting
+        // external
+        // IDs is delayed).
+        // Report this error only once per session.
+        static bool g_unmatched_unassociated_node_reported = false;
+        if (!g_unmatched_unassociated_node_reported) {
+          g_unmatched_unassociated_node_reported = true;
+          unrecoverable_error_handler_->CreateAndUploadError(
+              FROM_HERE,
+              "Unassociated sync node detected during optimistic association",
+              model_type());
+        }
       }
 
       syncer::SyncError error;