Implement FallbackSignalStrategy.

remoting/webapp/crd/js/signal_strategy.js

Index: remoting/webapp/crd/js/signal_strategy.js
diff --git a/remoting/webapp/crd/js/signal_strategy.js b/remoting/webapp/crd/js/signal_strategy.js
index 02c8acbd5f0cc27829d59aa1b6dbd8a6f020b57b..31cba54dbb6818e73bea9ce80e5790c4d3783034 100644
--- a/remoting/webapp/crd/js/signal_strategy.js
+++ b/remoting/webapp/crd/js/signal_strategy.js
@@ -23,6 +23,8 @@ remoting.SignalStrategy = function() {};
  *    CONNECTING -> FAILED (connection failed).
  *    HANDSHAKE -> FAILED (authentication failed).
  *    * -> CLOSED (dispose() called).
+ *
+ * Do not re-order these values without updating fallback_signal_strategy.js.
  */
 remoting.SignalStrategy.State = {
   NOT_CONNECTED: 0,
@@ -76,7 +78,28 @@ remoting.SignalStrategy.create = function(onStateChangedCallback) {
   // not the case for V1 app (socket API is available only to platform apps)
   // and for Chrome releases before 38.
   if (chrome.socket && chrome.socket.secure) {
-    return new remoting.XmppConnection(onStateChangedCallback);
+    return new remoting.FallbackSignalStrategy(
+        /**
+         * @param {function(remoting.SignalStrategy.State): void}
+         *     onStateChangedCallback_
+         */
+        function(onStateChangedCallback_) {

[Sergey Ulanov, 2015/01/13 19:43:51]

here and below: remove _ suffix from the name

[Sergey Ulanov, 2015/01/13 19:43:51]

Maybe move this function out of the argument list, to make this code more
readable.

[Jamie, 2015/01/14 01:36:26]

Done.

[Jamie, 2015/01/14 01:36:26]

Done.

+          return new remoting.XmppConnection(onStateChangedCallback_);
+        },
+        /**
+         * @param {function(remoting.SignalStrategy.State): void}
+         *     onStateChangedCallback_
+         */
+        function(onStateChangedCallback_) {
+          return new remoting.WcsAdapter(onStateChangedCallback_);
+        },
+        onStateChangedCallback,
+        /**
+         * @param {remoting.FallbackSignalStrategy.Result} progress
+         */
+        function(progress) {
+          console.warn('FallbackStrategyProgress: ' + progress);
+        });
   } else {
     return new remoting.WcsAdapter(onStateChangedCallback);
   }