[Chromoting] Enable jscompile for browser tests.

remoting/webapp/browser_test/mock_client_plugin.js

Index: remoting/webapp/browser_test/mock_client_plugin.js
diff --git a/remoting/webapp/browser_test/mock_client_plugin.js b/remoting/webapp/browser_test/mock_client_plugin.js
index e161a8f830b4facdb91563fd904d822a3b1c08df..2ba1145391a639f3c70ef1d22f88c0b0aaa84771 100644
--- a/remoting/webapp/browser_test/mock_client_plugin.js
+++ b/remoting/webapp/browser_test/mock_client_plugin.js
@@ -14,6 +14,7 @@
 var remoting = remoting || {};
 
 /**
+ * @param {Element} container
  * @constructor
  * @implements {remoting.ClientPlugin}
  */
@@ -135,8 +136,13 @@ remoting.MockClientPlugin.prototype.setOnOutgoingIqHandler =
 remoting.MockClientPlugin.prototype.setOnDebugMessageHandler =
     function(handler) {};
 
+/**
+ * @param {function(number, number):void} handler
+ * @private
+ */
 remoting.MockClientPlugin.prototype.setConnectionStatusUpdateHandler =
     function(handler) {
+  /** @type {function(number, number):void} */
   this.connectionStatusUpdateHandler_ = handler;
 };