Added HostListApl implementation to connect to legacy directory and GCD.

remoting/webapp/base/js/base.js

Index: remoting/webapp/base/js/base.js
diff --git a/remoting/webapp/base/js/base.js b/remoting/webapp/base/js/base.js
index ac6713209e52b5263001041048cc60cac3e77139..6bc2f5eddd95c93c40bcc9167b02174e78c63591 100644
--- a/remoting/webapp/base/js/base.js
+++ b/remoting/webapp/base/js/base.js
@@ -227,6 +227,16 @@ base.isEmptyObject = function(object) {
 };
 
 /**
+ * @param {!Map<K,V>} map
+ * @return {!Set<K>} A set of the keys in |map|.
+ * @template K
+ * @template V
+ */
+base.keySet = function(map) {

[kelvinp, 2015/07/20 18:00:51]

Why can't we call map.keys() directly?  Is this trying to make JSCompile happy?
Or is it because we want to return a copy of the keys instead?

[John Williams, 2015/07/20 21:43:10]

I need a Set (so I can test for membership), but Map.keys() returns an Iterator.
 All the typecasting is necessary because the externs files don't declare that
Iterator extends Iterable.

Anyway, this function is no longer needed in my latest patch.

+  return new Set(/** @type {!Iterable} */ (/** @type {*} */ (map.keys())));
+};
+
+/**
  * @type {boolean|undefined}
  * @private
  */