Add Sync datatype for shared managed user settings.

sync/internal_api/public/base_node.h

Index: sync/internal_api/public/base_node.h
diff --git a/sync/internal_api/public/base_node.h b/sync/internal_api/public/base_node.h
index 4f285dc68e3f7ab61515244fa412259355d4b85b..b29ab5bd5067dea414c2f42de33c78116abe7336 100644
--- a/sync/internal_api/public/base_node.h
+++ b/sync/internal_api/public/base_node.h
@@ -162,6 +162,12 @@ class SYNC_EXPORT BaseNode {
   // Can only be called if GetModelType() == MANAGED_USERS.
   const sync_pb::ManagedUserSpecifics& GetManagedUserSpecifics() const;
 
+  // Getter specific to the MANAGED_USER_SHARED_SETTINGS datatype.  Returns
+  // protobuf data.  Can only be called if GetModelType() ==
+  // MANAGED_USER_SHARED_SETTINGS.
+  const sync_pb::ManagedUserSharedSettingSpecifics&
+      GetManagedUserSharedSettingSpecifics() const;
+
   // Getter specific to the DEVICE_INFO datatype.  Returns protobuf
   // data.  Can only be called if GetModelType() == DEVICE_INFO.
   const sync_pb::DeviceInfoSpecifics& GetDeviceInfoSpecifics() const;