Issue 5383 - Add tests for the Chrome and Firefox packagers

ensure_dependencies.py

 #!/usr/bin/env python
 
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 import sys
 import os
 import posixpath
 import re
@@ skipping 408 matching lines @@
             for l in file_content:
                 print >>f, l
 
 
 if __name__ == '__main__':
     logging.basicConfig(format='%(levelname)s: %(message)s', level=logging.INFO)
 
     parser = argparse.ArgumentParser(description='Verify dependencies for a set of repositories, by default the repository of this script.')
     parser.add_argument('repos', metavar='repository', type=str, nargs='*', help='Repository path')
     parser.add_argument('-q', '--quiet', action='store_true', help='Suppress informational output')
+    parser.add_argument(
+        '--nodejs-only',
+        action='store_true',
+        help='Install Node.js production-only dependencies only'
+    )
     args = parser.parse_args()
 
     if args.quiet:
         logging.disable(logging.INFO)
 
-    repos = args.repos
-    if not len(repos):
-        repos = [os.path.dirname(__file__)]
-    for repo in repos:
-        resolve_deps(repo)
+    if args.nodejs_only:
+        resolve_npm_dependencies('.', get_repo_type('.'))
+    else:
+        repos = args.repos
+        if not len(repos):
+            repos = [os.path.dirname(__file__)]
+        for repo in repos:
+            resolve_deps(repo)