Files.app: Move the error handler to the top of combined script.

chrome/browser/resources/file_manager/js/error_counter.js

Index: chrome/browser/resources/file_manager/js/error_counter.js
diff --git a/chrome/browser/resources/file_manager/js/error_counter.js b/chrome/browser/resources/file_manager/js/error_counter.js
new file mode 100644
index 0000000000000000000000000000000000000000..4e61be880a7d2af5045eeea4b876b78f3eb7e609
--- /dev/null
+++ b/chrome/browser/resources/file_manager/js/error_counter.js
@@ -0,0 +1,16 @@
+// Copyright (c) 2013 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.
+
+'use strict';
+
+/**
+ * This variable is checked in SelectFileDialogExtensionBrowserTest.
+ * @type {number}
+ */
+window.JSErrorCount = 0;
+
+/**
+ * Count uncaught exceptions.
+ */
+window.onerror = function() { window.JSErrorCount++; };