Update pub to use the new command runner API in args.

sdk/lib/_internal/pub_generated/lib/src/command/build.dart

Index: sdk/lib/_internal/pub_generated/lib/src/command/build.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/command/build.dart b/sdk/lib/_internal/pub_generated/lib/src/command/build.dart
index 5aeb37634abdd88c595a1d82dc3996d3ae72885d..c3a98e7004136f34fbf7f30fd4c1341ae6817931 100644
--- a/sdk/lib/_internal/pub_generated/lib/src/command/build.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/command/build.dart
@@ -20,13 +20,14 @@ final _arrow = getSpecial('\u2192', '=>');
 
 /// Handles the `build` pub command.
 class BuildCommand extends BarbackCommand {
+  String get name => "build";
   String get description => "Apply transformers to build a package.";
-  String get usage => "pub build [options] [directories...]";
+  String get invocation => "pub build [argResults] [directories...]";
   String get docUrl => "http://dartlang.org/tools/pub/cmd/pub-build.html";
   List<String> get aliases => const ["deploy", "settle-up"];
 
   /// The path to the application's build output directory.
-  String get outputDirectory => commandOptions["output"];
+  String get outputDirectory => argResults["output"];
 
   List<String> get defaultSourceDirectories => ["web"];
 
@@ -34,13 +35,13 @@ class BuildCommand extends BarbackCommand {
   int builtFiles = 0;
 
   BuildCommand() {
-    commandParser.addOption(
+    argParser.addOption(
         "format",
         help: "How output should be displayed.",
         allowed: ["text", "json"],
         defaultsTo: "text");
 
-    commandParser.addOption(
+    argParser.addOption(
         "output",
         abbr: "o",
         help: "Directory to write build outputs to.",