sync: add WIFI_CREDENTIALS protobuf, ModelType, and preference

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 cace83b9818bcce5d9ac8fd1f62fa5471bdb6dd8..cd6875bb959919f1aacd3e4223de394434eea1ec 100644
--- a/sync/protocol/proto_value_conversions_unittest.cc
+++ b/sync/protocol/proto_value_conversions_unittest.cc
@@ -37,6 +37,7 @@
 #include "sync/protocol/sync.pb.h"
 #include "sync/protocol/theme_specifics.pb.h"
 #include "sync/protocol/typed_url_specifics.pb.h"
+#include "sync/protocol/wifi_credential_specifics.pb.h"
 #include "sync/util/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -58,7 +59,7 @@ 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(33, MODEL_TYPE_COUNT);
+  EXPECT_EQ(34, 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
@@ -507,6 +508,10 @@ TEST_F(ProtoValueConversionsTest, ArticleSpecificsToValue) {
   TestSpecificsToValue(ArticleSpecificsToValue);
 }
 
+TEST_F(ProtoValueConversionsTest, WifiCredentialSpecificsToValue) {
+  TestSpecificsToValue(WifiCredentialSpecificsToValue);
+}
+
 // TODO(akalin): Figure out how to better test EntitySpecificsToValue.
 
 TEST_F(ProtoValueConversionsTest, EntitySpecificsToValue) {
@@ -545,6 +550,7 @@ TEST_F(ProtoValueConversionsTest, EntitySpecificsToValue) {
   SET_FIELD(synced_notification_app_info);
   SET_FIELD(theme);
   SET_FIELD(typed_url);
+  SET_FIELD(wifi_credential);
 
 #undef SET_FIELD