[Android WebView] Prepare the copyrights scanner to run from presubmit scripts

android_webview/tools/third_party_files_whitelist.txt

 # Copyright (c) 2012 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.
 
 # This file records third-party licensing information for the purposes of the
 # Android WebView build. See webview_licenses.py for details.
 #
 # New third-party code should be added under a directory named 'third_party',
 # so additions to this file should be rare. See
 # http://www.chromium.org/developers/adding-3rd-party-libraries.
 
+# Contains test strings that look like copyrights.
+android_webview/tools/copyright_scanner_unittest.py
 # Copyright IBM; MIT license. This third-party code is taken from ICU, the
 # license for which we already pick up from third_party/icu/.
 base/i18n/icu_string_conversions.cc
 # Contains '(c)' in comments
 base/logging.h
 # Copyright Ron Rivest, public domain.
 base/md5.cc
 # Copyright Netscape Communications Corporation; MPL, GPL v2 or LGPL v2
 # license. This third-party code is taken from Mozilla, the license for which
 # we already pick up from third_party/npapi/.
@@ skipping 156 matching lines @@
 # Copyright The Chromium Authors and Apple Inc; BSD license. This third-party
 # code is taken from WebKit, the license for which we already pick up from
 # webkit/.
 content/browser/appcache/appcache_manifest_parser.h
 # Copyright The Chromium Authors and Netscape Communications Corporation; BSD
 # and (MPL, GPL v2 or LGPL v2) licenses. This third-party code is taken from
 # Mozilla, the license for which we already pick up from third_party/npapi/.
 content/child/multipart_response_delegate.h
 # String 'copyright' used in code.
 ui/webui/resources/js/cr/ui/array_data_model.js