Add sync experiment flag for wallet datatype.

sync/internal_api/sync_manager_impl.cc

Index: sync/internal_api/sync_manager_impl.cc
diff --git a/sync/internal_api/sync_manager_impl.cc b/sync/internal_api/sync_manager_impl.cc
index 8ff4843763e91ece862be273e31e94fbcb28e1b7..1655a24428ed151a01b48a1ba08c0f3981dcc248 100644
--- a/sync/internal_api/sync_manager_impl.cc
+++ b/sync/internal_api/sync_manager_impl.cc
@@ -1010,6 +1010,17 @@ bool SyncManagerImpl::ReceivedExperiment(Experiments* experiments) {
     }
   }
 
+  ReadNode wallet_sync_node(&trans);
+  if (wallet_sync_node.InitByClientTagLookup(
+          syncer::EXPERIMENTS, syncer::kWalletSyncTag) == BaseNode::INIT_OK) {
+    const sync_pb::WalletSyncFlags& wallet_sync =
+        wallet_sync_node.GetExperimentsSpecifics().wallet_sync();
+    if (wallet_sync.has_enabled()) {
+      experiments->wallet_sync_enabled = wallet_sync.enabled();
+      found_experiment = true;
+    }
+  }
+
   return found_experiment;
 }