[Chromoting] Enable jscompile for webapp unittests.

remoting/webapp/unittests/desktop_viewport_unittest.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function() {
 
 '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.
     var pluginSize = remoting.DesktopViewport.choosePluginSize(
         size(640, 480), 1.0, size(640, 480), dpi(96, 96), 1.0, false, true);
     QUnit.deepEqual(pluginSize, size(640, 480));
 
     // 2. Client logical dimensions smaller than host's.
     pluginSize = remoting.DesktopViewport.choosePluginSize(
         size(640, 480), 1.0, size(1024, 600), dpi(96, 96), 1.0, false, true);
@@ skipping 281 matching lines @@
 
     // 8. Client & host per-monitor dimensions match, two monitors stacked,
     //    high-DPI client & host.
     pluginSize = remoting.DesktopViewport.choosePluginSize(
         size(640, 480), 2.0, size(640, 2 * 480), dpi(192, 192),
         1.0, true, true);
     QUnit.deepEqual(pluginSize, size(640 / 2.0, (2 * 480) / 2.0));
 });
 
 })();