Added more typechecking functions and unit tests for existing code.

remoting/webapp/crd/js/host_list_api_impl.js

Index: remoting/webapp/crd/js/host_list_api_impl.js
diff --git a/remoting/webapp/crd/js/host_list_api_impl.js b/remoting/webapp/crd/js/host_list_api_impl.js
index 7f4bd8e189efe6cf1ea46680e0a70dcde3567805..52f9377e58a12aa64aa256b4094b69d3cc5397b7 100644
--- a/remoting/webapp/crd/js/host_list_api_impl.js
+++ b/remoting/webapp/crd/js/host_list_api_impl.js
@@ -115,15 +115,17 @@ remoting.HostListApiImpl.prototype.parseHostListResponse_ =
       var hosts = items.map(
         function(/** Object */ item) {
           var host = new remoting.Host();
-          host.hostName = getStringAttr(item, 'hostName', '');
-          host.hostId = getStringAttr(item, 'hostId', '');
-          host.status = getStringAttr(item, 'status', '');
-          host.jabberId = getStringAttr(item, 'jabberId', '');
-          host.publicKey = getStringAttr(item, 'publicKey', '');
-          host.hostVersion = getStringAttr(item, 'hostVersion', '');
-          host.tokenUrlPatterns = getArrayAttr(item, 'tokenUrlPatterns', []);
-          host.updatedTime = getStringAttr(item, 'updatedTime', '');
-          host.hostOfflineReason = getStringAttr(item, 'hostOfflineReason', '');
+          host.hostName = base.getStringAttr(item, 'hostName', '');
+          host.hostId = base.getStringAttr(item, 'hostId', '');
+          host.status = base.getStringAttr(item, 'status', '');
+          host.jabberId = base.getStringAttr(item, 'jabberId', '');
+          host.publicKey = base.getStringAttr(item, 'publicKey', '');
+          host.hostVersion = base.getStringAttr(item, 'hostVersion', '');
+          host.tokenUrlPatterns =
+              base.getArrayAttr(item, 'tokenUrlPatterns', []);
+          host.updatedTime = base.getStringAttr(item, 'updatedTime', '');
+          host.hostOfflineReason =
+              base.getStringAttr(item, 'hostOfflineReason', '');
           return host;
       });
       onDone(hosts);