Update Commit and GetUpdatesResponse messages to include attachment ids.

sync/internal_api/public/base/attachment_id_proto_unittest.cc

 // Copyright 2014 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.
 
 #include "sync/internal_api/public/base/attachment_id_proto.h"
 
 #include "base/strings/string_util.h"
 #include "testing/gmock/include/gmock/gmock-matchers.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace syncer {
 
 typedef testing::Test AttachmentIdProtoTest;
 
 // Verify that that we generate a proto with a properly formatted unique_id
 // field.
 TEST(AttachmentIdProtoTest, UniqueIdFormat) {
   sync_pb::AttachmentIdProto id_proto = CreateAttachmentIdProto();
   ASSERT_TRUE(id_proto.has_unique_id());
   // gtest's regular expression support is pretty poor so we cannot test as
   // closely as we would like.
   EXPECT_THAT(id_proto.unique_id(),
               testing::MatchesRegex(
                   "\\w\\w\\w\\w\\w\\w\\w\\w-\\w\\w\\w\\w-\\w\\w\\w\\w-"
                   "\\w\\w\\w\\w-\\w\\w\\w\\w\\w\\w\\w\\w\\w\\w\\w\\w"));
   EXPECT_EQ(StringToLowerASCII(id_proto.unique_id()), id_proto.unique_id());
 }
 
+TEST(AttachmentIdProtoTest, CreateAttachmentMetadata_Empty) {
+  google::protobuf::RepeatedPtrField<sync_pb::AttachmentIdProto> ids;
+  sync_pb::AttachmentMetadata metadata = CreateAttachmentMetadata(ids);
+  EXPECT_EQ(0, metadata.record_size());
+}
+
+TEST(AttachmentIdProtoTest, CreateAttachmentMetadata_NonEmpty) {
+  google::protobuf::RepeatedPtrField<sync_pb::AttachmentIdProto> ids;
+  *ids.Add() = CreateAttachmentIdProto();
+  *ids.Add() = CreateAttachmentIdProto();
+  *ids.Add() = CreateAttachmentIdProto();
+  sync_pb::AttachmentMetadata metadata = CreateAttachmentMetadata(ids);
+  ASSERT_EQ(3, metadata.record_size());
+  for (int i = 0; i < metadata.record_size(); ++i) {
+    EXPECT_EQ(ids.Get(i).SerializeAsString(),
+              metadata.record(i).id().SerializeAsString());
+    EXPECT_TRUE(metadata.record(i).is_on_server());
+  }
+}
+
 }  // namespace syncer