[Chromoting] Enable jscompile for webapp unittests.

remoting/webapp/unittests/test_start.js

Index: remoting/webapp/unittests/test_start.js
diff --git a/remoting/webapp/unittests/test_start.js b/remoting/webapp/unittests/test_start.js
new file mode 100644
index 0000000000000000000000000000000000000000..8159ce7b6745d8c2226ddda58d156d637985bde2
--- /dev/null
+++ b/remoting/webapp/unittests/test_start.js
@@ -0,0 +1,12 @@
+// 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.
+
+// Global test setup.
+// This code is run before each test in every module.
+
+QUnit.testStart(
+    /** @param {{module:string, name:string}} details */
+    function(details) {
+      sinonHelpers.reset();
+    });