Make Analyzer, VM and dart2js accept URI strings as part-of library identifier.

pkg/analyzer/test/src/task/dart_test.dart

 // Copyright (c) 2015, 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.
 
 library analyzer.test.src.task.dart_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
@@ skipping 852 matching lines @@
 part 'partA.dart';
 part 'partB.dart';
 ''',
       '/partA.dart': '''
 part of my_lib;
         ''',
       '/partB.dart': '''
 part of my_lib;
 '''
     });
-    _assertErrorsWithCodes(
-        [ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART]);
+    if (context.analysisOptions.enableUriInPartOf) {
+      // TODO(28522)
+      // Should report that names are wrong.
+    } else {
+      _assertErrorsWithCodes(
+          [ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART]);
+      AnalysisError error = errorListener.errors[0];
+    }
+  }
+
+  test_perform_error_missingLibraryDirectiveWithPart_noCommon() {
+    _performBuildTask({
+      '/lib.dart': '''
+part 'partA.dart';
+part 'partB.dart';
+''',
+      '/partA.dart': '''
+part of libA;
+        ''',
+      '/partB.dart': '''
+part of libB;
+'''
+    });
+    if (context.analysisOptions.enableUriInPartOf) {
+      // TODO(28522)
+      // Should report that names are wrong.
+    } else {
+      _assertErrorsWithCodes(
+          [ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART]);
+      AnalysisError error = errorListener.errors[0];
+    }
   }
 
   test_perform_error_partDoesNotExist() {
     _performBuildTask({
       '/lib.dart': '''
 library lib;
 part 'part.dart';
 '''
     });
     // we already report URI_DOES_NOT_EXIST, no need to report other errors
@@ skipping 4823 matching lines @@
   /**
    * Fill [errorListener] with [result] errors in the current [task].
    */
   void _fillErrorListener(ResultDescriptor<List<AnalysisError>> result) {
     List<AnalysisError> errors = task.outputs[result] as List<AnalysisError>;
     expect(errors, isNotNull, reason: result.name);
     errorListener = new GatheringErrorListener();
     errorListener.addAll(errors);
   }
 }