[Sync] Create new top-level sync/ directory

sync/protocol/password_specifics.proto

 // 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.
 //
 // Sync protocol datatype extension for password data.
 
 // Update proto_value_conversions{.h,.cc,_unittest.cc} if you change
 // any fields in this file.
 
 syntax = "proto2";
@@ skipping 21 matching lines @@
   optional int64 date_created = 11;
   optional bool blacklisted = 12;
 }
 
 // Properties of password sync objects. The actual password data is held in a
 // PasswordSpecificsData that is encrypted into |encrypted|.
 message PasswordSpecifics {
   optional EncryptedData encrypted = 1;
 }