Issue 21886. Make enums available outside of the defining library.

R=brianwilkerson@google.com
BUG= https://code.google.com/p/dart/issues/detail?id=21886

Review URL: https://codereview.chromium.org//809763002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@42403 260f80e4-7a28-3924-810f-c04153c831b5

pkg/analyzer/lib/src/generated/resolver.dart

@@ -10244,6 +10244,9 @@ class NamespaceBuilder {
     for (PropertyAccessorElement element in compilationUnit.accessors) {
       _addIfPublic(definedNames, element);
     }
+    for (ClassElement element in compilationUnit.enums) {
+      _addIfPublic(definedNames, element);
+    }
     for (FunctionElement element in compilationUnit.functions) {
       _addIfPublic(definedNames, element);
     }
@@ -11362,6 +11365,13 @@ class ResolverVisitor extends ScopedVisitor {
     return null;
   }
 
+  /**
+   * Prepares this [ResolverVisitor] to using it for incremental resolution.
+   */
+  void initForIncrementalResolution() {
+    _overrideManager.enterScope();
+  }
+
   /**
    * If it is appropriate to do so, override the current type of the static and propagated elements
    * associated with the given expression with the given type. Generally speaking, it is appropriate
@@ -11609,13 +11619,6 @@ class ResolverVisitor extends ScopedVisitor {
     return null;
   }
 
-  /**
-   * Prepares this [ResolverVisitor] to using it for incremental resolution.
-   */
-  void initForIncrementalResolution() {
-    _overrideManager.enterScope();
-  }
-
   @override
   Object visitCompilationUnit(CompilationUnit node) {
     //

pkg/analyzer/test/generated/resolver_test.dart

@@ -8672,6 +8672,21 @@ main() {}''');
     verify([source]);
   }
 
+  void test_enum_externalLibrary() {
+    resetWithEnum();
+    addNamedSource("/my_lib.dart", r'''
+library my_lib;
+enum EEE {A, B, C}''');
+    Source source = addSource(r'''
+import 'my_lib.dart';
+main() {
+  EEE e = null;
+}''');
+    resolve(source);
+    assertNoErrors(source);
+    verify([source]);
+  }
+
   void test_extractedMethodAsConstant() {
     Source source = addSource(r'''
 abstract class Comparable<T> {