Add support for multiple allowed domains

remoting/host/policy_watcher.cc

Index: remoting/host/policy_watcher.cc
diff --git a/remoting/host/policy_watcher.cc b/remoting/host/policy_watcher.cc
index b21da1bac6a43659e31ebaa26eb0564c17c72f15..8f4ce8dd790d65081d92f0a9df832abde1a10733 100644
--- a/remoting/host/policy_watcher.cc
+++ b/remoting/host/policy_watcher.cc
@@ -182,7 +182,11 @@ PolicyWatcher::PolicyWatcher(
   default_values_->SetBoolean(key::kRemoteAccessHostRequireCurtain, false);
   default_values_->SetBoolean(key::kRemoteAccessHostMatchUsername, false);
   default_values_->SetString(key::kRemoteAccessHostClientDomain, std::string());
+  default_values_->Set(key::kRemoteAccessHostClientDomainList,
+                       base::MakeUnique<base::ListValue>());
   default_values_->SetString(key::kRemoteAccessHostDomain, std::string());
+  default_values_->Set(key::kRemoteAccessHostDomainList,
+                       base::MakeUnique<base::ListValue>());
   default_values_->SetString(key::kRemoteAccessHostTalkGadgetPrefix,
                              kDefaultHostTalkGadgetPrefix);
   default_values_->SetString(key::kRemoteAccessHostTokenUrl, std::string());