[Chromoting] Enable jscompile for webapp unittests.

remoting/webapp/unittests/desktop_viewport_unittest.js

Index: remoting/webapp/unittests/desktop_viewport_unittest.js
diff --git a/remoting/webapp/unittests/desktop_viewport_unittest.js b/remoting/webapp/unittests/desktop_viewport_unittest.js
index 054bf57ed134201164f00c99a5e2d5ec0ae27c70..238c9254bfe49104edaff6465ace3b8c2ac1eebf 100644
--- a/remoting/webapp/unittests/desktop_viewport_unittest.js
+++ b/remoting/webapp/unittests/desktop_viewport_unittest.js
@@ -6,16 +6,26 @@
 
 'use strict';
 
-module('DesktopViewport');
-
+/**
+ * @param {number} width
+ * @param {number} height
+ * @return {{width:number, height:number}}
+ */
 function size(width, height) {
   return {width: width, height: height};
 }
 
+/**
+ * @param {number} x
+ * @param {number} y
+ * @return {{x:number, y:number}}
+ */
 function dpi(x, y) {
   return {x: x, y: y};
 }
 
+module('DesktopViewport');
+
 test('choosePluginSize() handles low-DPI client & host',
   function() {
     // 1. Client & host size the same.