Add --compile flag.

pkg/docgen/bin/docgen.dart

Index: pkg/docgen/bin/docgen.dart
===================================================================
--- pkg/docgen/bin/docgen.dart	(revision 32632)
+++ pkg/docgen/bin/docgen.dart	(working copy)
@@ -52,6 +52,7 @@
       out: options['out'],
       excludeLibraries: excludedLibraries,
       includeDependentPackages: options['include-dependent-packages'],
+      compile: options['compile'],
       serve: options['serve'],
       dartBinary: dartBinary,
       pubScript: pubScript,
@@ -124,6 +125,9 @@
   parser.addFlag('append',
       help: 'Append to the docs folder, library_list.json and index.txt',
       defaultsTo: false, negatable: false);
+  parser.addFlag('compile', help: 'Clone the documentation viewer repo locally '
+      '(if not already present) and compile with dart2js', defaultsTo: false,
+      negatable: false);
   parser.addFlag('serve', help: 'Clone the documentation viewer repo locally '
       '(if not already present) and start a simple server', defaultsTo: false,

[Emily Fortuna, 2014/02/13 00:27:56]

can we add "and compile with dart2js" here too, just to be clear that compile is
one step less than the serve option?

[dgrove, 2014/02/13 00:58:41]

Done.

       negatable: false);