Add recipes to the depgraph command.

recipes.py

 #!/usr/bin/env python
 # 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.
 
 """Tool to interact with recipe repositories.
 
 This tool operates on the nearest ancestor directory containing an
 infra/config/recipes.cfg.
 """
@@ skipping 193 matching lines @@
     v[project_id] = path
 
 
 def depgraph(package_deps, args):
   from recipe_engine import depgraph
   from recipe_engine import loader
 
   _, config_file = get_package_config(args)
   universe = loader.RecipeUniverse(package_deps, config_file)
 
-  depgraph.main(universe, ignore_packages=args.ignore_package,
-                stdout=args.output)
+  depgraph.main(universe, package_deps.root_package,
+                args.ignore_package, args.output, args.recipe_filter)
 
 
 def doc(package_deps, args):
   from recipe_engine import doc
   from recipe_engine import loader
 
   _, config_file = get_package_config(args)
   universe = loader.RecipeUniverse(package_deps, config_file)
 
   doc.main(universe)
@@ skipping 97 matching lines @@
            './recipes.py --package infra/config/recipes.cfg depgraph | tred | '
            'dot -Tpdf > graph.pdf')
   depgraph_p.set_defaults(command='depgraph')
   depgraph_p.add_argument(
       '--output', type=argparse.FileType('w'), default=sys.stdout,
       help='The file to write output to')
   depgraph_p.add_argument(
       '--ignore-package', action='append', default=[],
       help='Ignore a recipe package (e.g. recipe_engine). Can be passed '
            'multiple times')
+  depgraph_p.add_argument(
+      '--recipe-filter', default='',
+      help='A recipe substring to examine. If present, the depgraph will '
+           'include a recipe section containing recipes whose names contain '
+           'this substring. It will also filter all nodes of the graph to only '
+           'include modules touched by the filtered recipes.')
 
   doc_p = subp.add_parser(
       'doc',
       help='List all known modules reachable from the current package with '
            'various info about each')
   doc_p.set_defaults(command='doc')
 
   info_p = subp.add_parser(
       'info',
       help='Query information about the current recipe package')
@@ skipping 45 matching lines @@
 
     Warmly,
     recipes.py
     """
     return 1
 
   return 0
 
 if __name__ == '__main__':
   sys.exit(main())