Sync the launch type pref for apps.

sync/protocol/proto_enum_conversions.h

Index: sync/protocol/proto_enum_conversions.h
diff --git a/sync/protocol/proto_enum_conversions.h b/sync/protocol/proto_enum_conversions.h
index 6812cb7b8d0dec12d70525bd5839a2a5610cfcb2..224abbc3a0b81255e9be86f84f9781f89fb6a125 100644
--- a/sync/protocol/proto_enum_conversions.h
+++ b/sync/protocol/proto_enum_conversions.h
@@ -9,6 +9,7 @@
 
 #include "sync/base/sync_export.h"
 #include "sync/protocol/app_list_specifics.pb.h"
+#include "sync/protocol/app_specifics.pb.h"
 #include "sync/protocol/client_debug_info.pb.h"
 #include "sync/protocol/session_specifics.pb.h"
 #include "sync/protocol/sync.pb.h"
@@ -49,6 +50,10 @@ SYNC_EXPORT_PRIVATE const char* GetErrorTypeString(
 SYNC_EXPORT_PRIVATE const char* GetActionString(
     sync_pb::SyncEnums::Action action);
 
+SYNC_EXPORT_PRIVATE const char* GetLaunchTypeString(
+    sync_pb::AppSpecifics::LaunchType launch_type);
+
+
 const char* GetDeviceTypeString(sync_pb::SyncEnums::DeviceType device_type);
 
 const char* GetFaviconTypeString(sync_pb::SessionTab::FaviconType favicon_type);