Dactyloidae iOS initial commit

mobile/ios/Storage/Syncable.swift

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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Shared
+
+/**
+ * This exists to allow resets after meta/global or crypto/key changes.
+ *
+ * 'Reset' in this case means that timestamps and progress tracking are
+ * discarded: this storage is reconfigured such that all data will be
+ * reuploaded, and all data will be re-merged as necessary.
+ *
+ * This protocol is primarily consumed by `ResettableSynchronizer`, and
+ * is invoked when a significant server change is observed — changed keys,
+ * changed engine elections or syncIDs, or a node reassignment.
+ */
+public protocol ResettableSyncStorage {
+    func resetClient() -> Success
+}
+
+public protocol AccountRemovalDelegate {
+    func onRemovedAccount() -> Success
+}