create another copy of libraries.dart for 1.12-dev SDK

tool/patch_sdk.dart

 #!/usr/bin/env 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.
 
 /// Command line tool to merge the SDK libraries and our patch files.
 /// This is currently designed as an offline tool, but we could automate it.
 library dev_compiler.tool.patch_sdk;
 
 import 'dart:io';
@@ skipping 28 matching lines @@
   var sdkOut = path.join(argv[1], 'lib');
   var privateLibOut =
       path.normalize(path.join(sdkOut, '_internal', 'compiler', 'js_lib'));
 
   var INTERNAL_PATH = '_internal/compiler/js_lib/';
 
   // Copy libraries.dart and version
   var libContents = new File(path.join(sdkLibIn, '_internal', 'libraries.dart'))
       .readAsStringSync();
   _writeSync(path.join(sdkOut, '_internal', 'libraries.dart'), libContents);
+  _writeSync(path.join(sdkOut, '_internal', 'sdk_library_metadata', 'lib', 'libraries.dart'), libContents);
   _writeSync(path.join(sdkOut, '..', 'version'),
       new File(path.join(sdkLibIn, '..', 'version')).readAsStringSync());
 
   // Parse libraries.dart
   var sdkLibraries = _getSdkLibraries(libContents);
 
   // Enumerate core libraries and apply patches
   for (SdkLibrary library in sdkLibraries) {
     // TODO(jmesserly): analyzer does not handle the default case of
     // "both platforms" correctly, and treats it as being supported on neither.
@@ skipping 331 matching lines @@
     if (diff != 0) return diff;
     return end - other.end;
   }
 }
 
 List<SdkLibrary> _getSdkLibraries(String contents) {
   var libraryBuilder = new SdkLibrariesReader_LibraryBuilder(true);
   parseCompilationUnit(contents).accept(libraryBuilder);
   return libraryBuilder.librariesMap.sdkLibraries;
 }