[Sync] Create new top-level sync/ directory

sync/protocol/encryption.proto

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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.
 //
 // Common sync protocol for encrypted data.
 
 // Update proto_value_conversions{.h,.cc,_unittest.cc} if you change
 // any fields in this file.
 
 syntax = "proto2";
 
@@ skipping 11 matching lines @@
 // that happens, we make a best effort to reencrypt all nodes with the new
 // passphrase, but since we don't have transactions on the server-side, we
 // cannot guarantee that every node will be reencrypted. As a workaround, we
 // keep track of all keys, assign each key a name (by using that key to encrypt
 // a well known string) and keep track of which key was used to encrypt each
 // node.
 message EncryptedData {
   optional string key_name = 1;
   optional string blob = 2;
 };