sync: make scheduling logic and job ownership more obvious.

sync/internal_api/public/sessions/model_neutral_state.cc

Index: sync/internal_api/public/sessions/model_neutral_state.cc
diff --git a/sync/internal_api/public/sessions/model_neutral_state.cc b/sync/internal_api/public/sessions/model_neutral_state.cc
index 9ae84369211e0efa9e297915aa6c3fe8d4ce033e..2287c911d394766f70092a62ccd7bdf04b1cb9bf 100644
--- a/sync/internal_api/public/sessions/model_neutral_state.cc
+++ b/sync/internal_api/public/sessions/model_neutral_state.cc
@@ -26,5 +26,13 @@ ModelNeutralState::ModelNeutralState()
 
 ModelNeutralState::~ModelNeutralState() {}
 
+bool HasSyncerError(const ModelNeutralState& state) {
+  const bool get_key_error = SyncerErrorIsError(state.last_get_key_result);
+  const bool download_updates_error =
+      SyncerErrorIsError(state.last_download_updates_result);
+  const bool commit_error = SyncerErrorIsError(state.commit_result);
+  return get_key_error || download_updates_error || commit_error;
+}
+
 }  // namespace sessions
 }  // namespace syncer