sync: Add ControlPreference protobuf and supporting code

sync/internal_api/sync_manager_impl_unittest.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Unit tests for the SyncApi. Note that a lot of the underlying
 // functionality is provided by the Syncable layer, which has its own
 // unit tests. We'll test SyncApi specific things in this harness.
 
 #include <cstddef>
 #include <map>
@@ skipping 845 matching lines @@
 
   void GetModelSafeRoutingInfo(ModelSafeRoutingInfo* out) {
     (*out)[NIGORI] = GROUP_PASSIVE;
     (*out)[DEVICE_INFO] = GROUP_PASSIVE;
     (*out)[EXPERIMENTS] = GROUP_PASSIVE;
     (*out)[BOOKMARKS] = GROUP_PASSIVE;
     (*out)[THEMES] = GROUP_PASSIVE;
     (*out)[SESSIONS] = GROUP_PASSIVE;
     (*out)[PASSWORDS] = GROUP_PASSIVE;
     (*out)[PREFERENCES] = GROUP_PASSIVE;
+    (*out)[PRIORITY_PREFERENCES] = GROUP_PASSIVE;
   }
 
   virtual void OnChangesApplied(
       ModelType model_type,
       int64 model_version,
       const BaseTransaction* trans,
       const ImmutableChangeRecordList& changes) OVERRIDE {}
 
   virtual void OnChangesComplete(ModelType model_type) OVERRIDE {}
 
@@ skipping 364 matching lines @@
     ListValue args;
     args.Append(Value::CreateStringValue("1"));
     SendJsMessage("getChildNodeIds",
                   JsArgList(&args), reply_handler.AsWeakHandle());
   }
 
   EXPECT_EQ(1u, return_args.Get().GetSize());
   const ListValue* nodes = NULL;
   ASSERT_TRUE(return_args.Get().GetList(0, &nodes));
   ASSERT_TRUE(nodes);
-  EXPECT_EQ(8u, nodes->GetSize());
+  EXPECT_EQ(9u, nodes->GetSize());
 }
 
 TEST_F(SyncManagerTest, GetChildNodeIdsFailure) {
   StrictMock<MockJsReplyHandler> reply_handler;
 
   ListValue empty_list_args;
   empty_list_args.Append(new ListValue());
 
   EXPECT_CALL(reply_handler,
               HandleJsReply("getChildNodeIds",
@@ skipping 1796 matching lines @@
       Difference(ModelTypeSet::All(), disabled_types);
 
   // Verify only the non-disabled types remain after cleanup.
   sync_manager_.PurgeDisabledTypes(enabled_types, new_enabled_types);
   EXPECT_TRUE(new_enabled_types.Equals(sync_manager_.InitialSyncEndedTypes()));
   EXPECT_TRUE(disabled_types.Equals(
       sync_manager_.GetTypesWithEmptyProgressMarkerToken(ModelTypeSet::All())));
 }
 
 }  // namespace