Create binstubs for executables when activating a package.

sdk/lib/_internal/pub_generated/lib/src/pubspec.dart

Index: sdk/lib/_internal/pub_generated/lib/src/pubspec.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/pubspec.dart b/sdk/lib/_internal/pub_generated/lib/src/pubspec.dart
index ce32ae2cbb980577b2c52da5d3b4c2b8cf79a7c5..17620557a8681e849638596812ec1e43613645fd 100644
--- a/sdk/lib/_internal/pub_generated/lib/src/pubspec.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/pubspec.dart
@@ -171,6 +171,42 @@ class Pubspec {
   }
   bool _parsedPublishTo = false;
   String _publishTo;
+  Map<String, String> get executables {
+    if (_executables != null) return _executables;
+    var yaml = fields['executables'];
+    if (yaml == null) {
+      _executables = {};
+      return _executables;
+    }
+    if (yaml is! Map) {
+      _error(
+          '"executables" field must be a map.',
+          fields.nodes['executables'].span);
+    }
+    yaml.nodes.forEach((key, value) {
+      validateName(name, description) {
+        final validName = new RegExp(r"^[a-zA-Z0-9_-]+$");
+        if (!validName.hasMatch(name.value)) {
+          _error(
+              '"executables" $description may only contain letters, '
+                  'numbers, hyphens and underscores.',
+              name.span);
+        }
+      }
+      if (key.value is! String) {
+        _error('"executables" keys must be strings.', key.span);
+      }
+      validateName(key, "keys");
+      if (value.value == null) return;
+      if (value.value is! String) {
+        _error('"executables" values must be strings or null.', value.span);
+      }
+      validateName(value, "values");
+    });
+    _executables = yaml;
+    return _executables;
+  }
+  Map<String, String> _executables;
   bool get isPrivate => publishTo == "none";
   bool get isEmpty =>
       name == null && version == Version.none && dependencies.isEmpty;