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

pkg/analyzer/test/generated/parser_test.dart

 // Copyright (c) 2014, 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.generated.parser_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_ast_factory.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
@@ skipping 2300 matching lines @@
   }
 
   void test_nonIdentifierLibraryName_library() {
     CompilationUnit unit = ParserTestCase.parseCompilationUnit(
         "library 'lib';", [ParserErrorCode.NON_IDENTIFIER_LIBRARY_NAME]);
     expect(unit, isNotNull);
   }
 
   void test_nonIdentifierLibraryName_partOf() {
     CompilationUnit unit = ParserTestCase.parseCompilationUnit(
-        "part of 'lib';", [ParserErrorCode.NON_IDENTIFIER_LIBRARY_NAME]);
+        "part of 'lib';", []);

[Brian Wilkerson, 2017/01/25 17:05:14]

We should still check that this error is emitted when the `of` is followed by an
invalid token. Perhaps change the test to "part of 3;".

[Lasse Reichstein Nielsen, 2017/01/26 10:39:13]

Done.

     expect(unit, isNotNull);
   }
 
   void test_nonPartOfDirectiveInPart_after() {
     ParserTestCase.parseCompilationUnit("part of l; part 'f.dart';",
         [ParserErrorCode.NON_PART_OF_DIRECTIVE_IN_PART]);
   }
 
   void test_nonPartOfDirectiveInPart_before() {
     ParserTestCase.parseCompilationUnit("part 'f.dart'; part of m;",
@@ skipping 12272 matching lines @@
   CompilationUnit _parseDirectives(String source,
       [List<ErrorCode> errorCodes = const <ErrorCode>[]]) {
     createParser(source);
     CompilationUnit unit = parser.parseDirectives2();
     expect(unit, isNotNull);
     expect(unit.declarations, hasLength(0));
     listener.assertErrorsWithCodes(errorCodes);
     return unit;
   }
 }