chromoting: Add JS externs for qunit.

remoting/remoting_webapp_files.gypi

 # Copyright 2014 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.
 
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 # .JMML. .JMM.`Mbmmd' `Moo9^Yo.`Wbmd"MML..JMML  JMML  JMML.`Mbmmd'
 #
 # Please keep this file in sync with remoting/webapp/files.gni.
 
 {
   'variables': {
 
+    # JSCompiler externs.
+    'remoting_webapp_js_externs': [
+      'webapp/externs/qunit.js',
+    ],
+
     # Jscompile proto files.
     # These provide type information for jscompile.
     'remoting_webapp_js_proto_files': [
       'webapp/js_proto/chrome_proto.js',
       'webapp/js_proto/chrome_cast_proto.js',
       'webapp/js_proto/dom_proto.js',
       'webapp/js_proto/remoting_proto.js',
     ],
 
     #
@@ skipping 499 matching lines @@
       '<(remoting_webapp_template_background)',
       '<(remoting_webapp_template_main)',
       '<(remoting_webapp_template_message_window)',
       '<(remoting_webapp_template_wcs_sandbox)',
       '<@(remoting_webapp_template_files)',
       '<@(remoting_webapp_crd_js_files)',
     ],
 
   },
 }