Update sync API to support attachments.

sync/protocol/proto_value_conversions_unittest.cc

 // 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.
 
 // Keep this file in sync with the .proto files in this directory.
 
 #include "sync/protocol/proto_value_conversions.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 350 matching lines @@
   EXPECT_TRUE(ValueHasSpecifics(*(value_with_specifics.get()),
                                 "get_updates.entries"));
 
   scoped_ptr<base::DictionaryValue> value_without_specifics(
       ClientToServerResponseToValue(message, false /* include_specifics */));
   EXPECT_FALSE(value_without_specifics->empty());
   EXPECT_FALSE(ValueHasSpecifics(*(value_without_specifics.get()),
                                  "get_updates.entries"));
 }
 
+TEST_F(ProtoValueConversionsTest, AttachmentIdProtoToValue) {
+  TestSpecificsToValue(AttachmentIdProtoToValue);
+}
+
 }  // namespace
 }  // namespace syncer