Record defined top-level/class-mebber names with unlinked bundles.

pkg/analyzer/lib/src/dart/analysis/defined_names.dart

Index: pkg/analyzer/lib/src/dart/analysis/defined_names.dart
diff --git a/pkg/analyzer/lib/src/dart/analysis/defined_names.dart b/pkg/analyzer/lib/src/dart/analysis/defined_names.dart
new file mode 100644
index 0000000000000000000000000000000000000000..58d0a65c1776272b91abc3d076e0974fa2019b95
--- /dev/null
+++ b/pkg/analyzer/lib/src/dart/analysis/defined_names.dart
@@ -0,0 +1,53 @@
+// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:analyzer/dart/ast/ast.dart';
+
+/**
+ * Compute the [DefinedNames] for the given [unit].
+ */
+DefinedNames computeDefinedNames(CompilationUnit unit) {
+  DefinedNames names = new DefinedNames();
+
+  void appendName(Set<String> names, SimpleIdentifier node) {
+    String name = node?.name;
+    if (name != null && name.length != 0) {
+      names.add(name);
+    }
+  }
+
+  void appendClassMemberName(ClassMember member) {
+    if (member is MethodDeclaration) {
+      appendName(names.classMemberNames, member.name);
+    } else if (member is FieldDeclaration) {
+      for (VariableDeclaration field in member.fields.variables) {
+        appendName(names.classMemberNames, field.name);
+      }
+    }
+  }
+
+  void appendTopLevelName(CompilationUnitMember member) {
+    if (member is NamedCompilationUnitMember) {
+      appendName(names.topLevelNames, member.name);
+      if (member is ClassDeclaration) {
+        member.members.forEach(appendClassMemberName);
+      }
+    } else if (member is TopLevelVariableDeclaration) {
+      for (VariableDeclaration variable in member.variables.variables) {
+        appendName(names.topLevelNames, variable.name);
+      }
+    }
+  }
+
+  unit.declarations.forEach(appendTopLevelName);
+  return names;
+}
+
+/**
+ * Defined top-level and class member names.
+ */
+class DefinedNames {
+  final Set<String> topLevelNames = new Set<String>();
+  final Set<String> classMemberNames = new Set<String>();
+}