Emit warning on import of dart:mirrors.

tests/compiler/dart2js/memory_compiler.dart

 // Copyright (c) 2013, 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 dart2js.test.memory_compiler;
 
 import 'memory_source_file_helper.dart';
 
 import 'package:compiler/src/dart2jslib.dart'
        show NullSink;
 
 import 'package:compiler/compiler.dart'
-       show Diagnostic, DiagnosticHandler, CompilerOutputProvider;
+    show Diagnostic, DiagnosticHandler, CompilerOutputProvider;
 
 import 'dart:async';
 
 import 'package:compiler/src/mirrors/source_mirrors.dart';
 import 'package:compiler/src/mirrors/analyze.dart';
 
+import 'package:compiler/src/library_loader.dart'
+    show LoadedLibraries;
+
 class DiagnosticMessage {
   final Uri uri;
   final int begin;
   final int end;
   final String message;
   final Diagnostic kind;
 
   DiagnosticMessage(this.uri, this.begin, this.end, this.message, this.kind);
 
   String toString() => '$uri:$begin:$end:$message:$kind';
@@ skipping 146 matching lines @@
         if (library.isPatched) {
           var patchLibrary = library.patch;
           compiler.onLibraryCreated(patchLibrary);
           compiler.onLibraryScanned(patchLibrary, null);
         }
         copiedLibraries[library.canonicalUri] = library;
       }
     });
     // TODO(johnniwinther): Assert that no libraries are loaded lazily from
     // this call.
-    compiler.onLibrariesLoaded(copiedLibraries);
+    compiler.onLibrariesLoaded(new MemoryLoadedLibraries(copiedLibraries));
 
     compiler.symbolConstructor = cachedCompiler.symbolConstructor;
     compiler.mirrorSystemClass = cachedCompiler.mirrorSystemClass;
     compiler.mirrorsUsedClass = cachedCompiler.mirrorsUsedClass;
     compiler.mirrorSystemGetNameFunction =
         cachedCompiler.mirrorSystemGetNameFunction;
     compiler.symbolImplementationClass =
         cachedCompiler.symbolImplementationClass;
     compiler.symbolValidatedConstructor =
         cachedCompiler.symbolValidatedConstructor;
@@ skipping 25 matching lines @@
     // Don't null out the enqueuer as it prevents us from using cachedCompiler
     // more than once.
     cachedCompiler.deferredLoadTask = null;
     cachedCompiler.mirrorUsageAnalyzerTask = null;
     cachedCompiler.dumpInfoTask = null;
     cachedCompiler.buildId = null;
   }
   return compiler;
 }
 
+class MemoryLoadedLibraries implements LoadedLibraries {
+  final Map copiedLibraries;
+
+  MemoryLoadedLibraries(this.copiedLibraries);
+
+  @override
+  bool containsLibrary(Uri uri) => copiedLibraries.containsKey(uri);
+
+  @override
+  void forEachImportChain(f) {}
+
+  @override
+  void forEachLibrary(f) {}
+
+  @override
+  getLibrary(Uri uri) => copiedLibraries[uri];
+
+  @override
+  Uri get rootUri => null;
+}
+
 Future<MirrorSystem> mirrorSystemFor(Map<String,String> memorySourceFiles,
                                      {DiagnosticHandler diagnosticHandler,
                                       List<String> options: const [],
                                       bool showDiagnostics: true}) {
   Uri libraryRoot = Uri.base.resolve('sdk/');
   Uri packageRoot = Uri.base.resolveUri(
       new Uri.file('${Platform.packageRoot}/'));
 
   var provider = new MemorySourceFileProvider(memorySourceFiles);
   var handler =
       createDiagnosticHandler(diagnosticHandler, provider, showDiagnostics);
 
   List<Uri> libraries = <Uri>[];
   memorySourceFiles.forEach((String path, _) {
     libraries.add(new Uri(scheme: 'memory', path: path));
   });
 
   return analyze(libraries, libraryRoot, packageRoot,
                  provider, handler, options);
 }