Added more typechecking functions and unit tests for existing code.

remoting/webapp/js_proto/qunit_proto.js

Index: remoting/webapp/js_proto/qunit_proto.js
diff --git a/remoting/webapp/js_proto/qunit_proto.js b/remoting/webapp/js_proto/qunit_proto.js
index 8eb96452f3a29176ff3393156f14a0fbad227fb6..5ae635849659ad3dadc2ac25134d06e83414b031 100644
--- a/remoting/webapp/js_proto/qunit_proto.js
+++ b/remoting/webapp/js_proto/qunit_proto.js
@@ -45,6 +45,20 @@ QUnit.equal = function(a, b, opt_message) {};
 
 /**
  * @param {*} a
+ * @param {*} b
+ * @param {string=} opt_message
+ */
+QUnit.strictEqual = function(a, b, opt_message) {};
+
+/**
+ * @param {Function} func
+ * @param {*=} opt_error
+ * @param {string=} opt_message
+ */
+QUnit.throws = function(func, opt_error, opt_message) {};
+
+/**
+ * @param {*} a
  */
 QUnit.expect = function(a) {};