arc: Create sync protos for Arc package.

sync/protocol/proto_value_conversions_unittest.cc

Index: sync/protocol/proto_value_conversions_unittest.cc
diff --git a/sync/protocol/proto_value_conversions_unittest.cc b/sync/protocol/proto_value_conversions_unittest.cc
index 1e091f6831bd7e8d81666b408e64411c8e28cddf..c386e108a88339fe80ca291c6e9d2bc6a5be1647 100644
--- a/sync/protocol/proto_value_conversions_unittest.cc
+++ b/sync/protocol/proto_value_conversions_unittest.cc
@@ -60,7 +60,7 @@ TEST_F(ProtoValueConversionsTest, ProtoChangeCheck) {
   // If this number changes, that means we added or removed a data
   // type.  Don't forget to add a unit test for {New
   // type}SpecificsToValue below.
-  EXPECT_EQ(36, MODEL_TYPE_COUNT);
+  EXPECT_EQ(37, MODEL_TYPE_COUNT);
 
   // We'd also like to check if we changed any field in our messages.
   // However, that's hard to do: sizeof could work, but it's
@@ -130,6 +130,10 @@ TEST_F(ProtoValueConversionsTest, AppSpecificsToValue) {
   TestSpecificsToValue(AppSpecificsToValue);
 }
 
+TEST_F(ProtoValueConversionsTest, ArcPackageSpecificsToValue) {
+  TestSpecificsToValue(ArcPackageSpecificsToValue);
+}
+
 TEST_F(ProtoValueConversionsTest, AutofillSpecificsToValue) {
   TestSpecificsToValue(AutofillSpecificsToValue);
 }
@@ -302,6 +306,7 @@ TEST_F(ProtoValueConversionsTest, EntitySpecificsToValue) {
   SET_FIELD(app_list);
   SET_FIELD(app_notification);
   SET_FIELD(app_setting);
+  SET_FIELD(arc_package);
   SET_FIELD(article);
   SET_FIELD(autofill);
   SET_FIELD(autofill_profile);