Add Sync datatype for shared managed user settings.

sync/syncable/model_type.cc

Index: sync/syncable/model_type.cc
diff --git a/sync/syncable/model_type.cc b/sync/syncable/model_type.cc
index aac057fdf284756226121d758136ccbaab772499..686251fe5e0deeb40ef6ee7084d0fb0e84ff970d 100644
--- a/sync/syncable/model_type.cc
+++ b/sync/syncable/model_type.cc
@@ -107,6 +107,9 @@ void AddDefaultFieldValue(ModelType datatype,
     case MANAGED_USERS:
       specifics->mutable_managed_user();
       break;
+    case MANAGED_USER_SHARED_SETTINGS:
+      specifics->mutable_managed_user_shared_setting();
+      break;
     case ARTICLES:
       specifics->mutable_article();
       break;
@@ -200,6 +203,8 @@ int GetSpecificsFieldNumberFromModelType(ModelType model_type) {
       return sync_pb::EntitySpecifics::kManagedUserSettingFieldNumber;
     case MANAGED_USERS:
       return sync_pb::EntitySpecifics::kManagedUserFieldNumber;
+    case MANAGED_USER_SHARED_SETTINGS:
+      return sync_pb::EntitySpecifics::kManagedUserSharedSettingFieldNumber;
     case ARTICLES:
       return sync_pb::EntitySpecifics::kArticleFieldNumber;
     default:
@@ -321,6 +326,9 @@ ModelType GetModelTypeFromSpecifics(const sync_pb::EntitySpecifics& specifics) {
   if (specifics.has_managed_user())
     return MANAGED_USERS;
 
+  if (specifics.has_managed_user_shared_setting())
+    return MANAGED_USER_SHARED_SETTINGS;
+
   if (specifics.has_article())
     return ARTICLES;
 
@@ -377,6 +385,9 @@ ModelTypeSet EncryptableUserTypes() {
   encryptable_user_types.Remove(MANAGED_USER_SETTINGS);
   // Managed users are not encrypted since they are managed server-side.
   encryptable_user_types.Remove(MANAGED_USERS);
+  // Managed user shared settings are not encrypted since they are managed
+  // server-side and shared between manager and supervised user.
+  encryptable_user_types.Remove(MANAGED_USER_SHARED_SETTINGS);
   // Proxy types have no sync representation and are therefore not encrypted.
   // Note however that proxy types map to one or more protocol types, which
   // may or may not be encrypted themselves.
@@ -489,6 +500,8 @@ const char* ModelTypeToString(ModelType model_type) {
       return "Managed User Settings";
     case MANAGED_USERS:
       return "Managed Users";
+    case MANAGED_USER_SHARED_SETTINGS:
+      return "Managed User Shared Settings";
     case ARTICLES:
       return "Articles";
     case PROXY_TABS:
@@ -564,6 +577,8 @@ int ModelTypeToHistogramInt(ModelType model_type) {
       return 27;
     case ARTICLES:
       return 28;
+    case MANAGED_USER_SHARED_SETTINGS:
+      return 29;
     // Silence a compiler warning.
     case MODEL_TYPE_COUNT:
       return 0;
@@ -649,6 +664,8 @@ ModelType ModelTypeFromString(const std::string& model_type_string) {
     return MANAGED_USER_SETTINGS;
   else if (model_type_string == "Managed Users")
     return MANAGED_USERS;
+  else if (model_type_string == "Managed User Shared Settings")
+    return MANAGED_USER_SHARED_SETTINGS;
   else if (model_type_string == "Articles")
     return ARTICLES;
   else if (model_type_string == "Tabs")
@@ -743,6 +760,8 @@ std::string ModelTypeToRootTag(ModelType type) {
       return "google_chrome_managed_user_settings";
     case MANAGED_USERS:
       return "google_chrome_managed_users";
+    case MANAGED_USER_SHARED_SETTINGS:
+      return "google_chrome_managed_user_shared_settings";
     case ARTICLES:
       return "google_chrome_articles";
     case PROXY_TABS:
@@ -784,6 +803,8 @@ const char kFaviconImageNotificationType[] = "FAVICON_IMAGE";
 const char kFaviconTrackingNotificationType[] = "FAVICON_TRACKING";
 const char kManagedUserSettingNotificationType[] = "MANAGED_USER_SETTING";
 const char kManagedUserNotificationType[] = "MANAGED_USER";
+const char kManagedUserSharedSettingNotificationType[] =
+    "MANAGED_USER_SHARED_SETTING";
 const char kArticleNotificationType[] = "ARTICLE";
 }  // namespace
 
@@ -865,6 +886,9 @@ bool RealModelTypeToNotificationType(ModelType model_type,
     case MANAGED_USERS:
       *notification_type = kManagedUserNotificationType;
       return true;
+    case MANAGED_USER_SHARED_SETTINGS:
+      *notification_type = kManagedUserSharedSettingNotificationType;
+      return true;
     case ARTICLES:
       *notification_type = kArticleNotificationType;
       return true;
@@ -952,6 +976,9 @@ bool NotificationTypeToRealModelType(const std::string& notification_type,
   } else if (notification_type == kManagedUserNotificationType) {
     *model_type = MANAGED_USERS;
     return true;
+  } else if (notification_type == kManagedUserSharedSettingNotificationType) {
+    *model_type = MANAGED_USER_SHARED_SETTINGS;
+    return true;
   } else if (notification_type == kArticleNotificationType) {
     *model_type = ARTICLES;
     return true;