remoting.Identity unit-tests and fixes.

remoting/webapp/js_proto/sinon_proto.js

Index: remoting/webapp/js_proto/sinon_proto.js
diff --git a/remoting/webapp/js_proto/sinon_proto.js b/remoting/webapp/js_proto/sinon_proto.js
index 6cf1ab3e2d94f3b1360a6fa11165757c138fc090..d7e1a2feeb352ca63d3a00891f7d7747d9ce3198 100644
--- a/remoting/webapp/js_proto/sinon_proto.js
+++ b/remoting/webapp/js_proto/sinon_proto.js
@@ -83,6 +83,9 @@ sinon.Spy.prototype.callCount;
 /** @type {boolean} */
 sinon.Spy.prototype.called = false;
 
+/** @type {boolean} */
+sinon.Spy.prototype.calledOnce = false;
+
 /** @type {function(...):boolean} */
 sinon.Spy.prototype.calledWith = function() {};
 
@@ -91,6 +94,8 @@ sinon.Spy.prototype.getCall = function(index) {};
 
 sinon.Spy.prototype.reset = function() {};
 
+sinon.Spy.prototype.restore = function() {};
+
 /**
  * @param {Object} obj
  * @param {string} method