Add info feature of cros_workon back

This helps new developers find the source code for a package.

BUG=brillo:983
TEST=`cros_workon --all info`

Change-Id: I4175fe5476d66b7a647ee4d7b490175a5823385f
Reviewed-on: https://chromium-review.googlesource.com/270147
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Commit-Queue: Christopher Wiley <wiley@chromium.org>
Tested-by: Christopher Wiley <wiley@chromium.org>
diff --git a/scripts/cros_workon.py b/scripts/cros_workon.py
index 5ca6f09..22e03fc 100644
--- a/scripts/cros_workon.py
+++ b/scripts/cros_workon.py
@@ -116,7 +116,10 @@
       helper.StopWorkingOnPackages(options.packages, use_all=options.all,
                                    use_workon_only=options.workon_only)
     elif options.command == 'info':
-      cros_build_lib.Die('%s is not implemented.', options.command)
+      triples = helper.GetPackageInfo(options.packages, use_all=options.all,
+                                      use_workon_only=options.workon_only)
+      for package, repos, paths in triples:
+        print(package, ','.join(repos), ','.join(paths))
     elif options.command == 'list':
       packages = helper.ListAtoms(
           use_all=options.all, use_workon_only=options.workon_only)