WIP: Add custom platform library.

pkg/compiler/lib/src/dart2js.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.cmdline;
 
 import 'dart:async' show EventSink, Future;
 import 'dart:convert' show UTF8, LineSplitter;
 import 'dart:io' show exit, File, FileMode, Platform, stdin, stderr;
 
@@ skipping 349 matching lines @@
     new OptionHandler('--packages=.+', setPackageConfig),
     new OptionHandler('--package-root=.+|-p.+', setPackageRoot),
     new OptionHandler(Flags.analyzeAll, setAnalyzeAll),
     new OptionHandler(Flags.analyzeOnly, setAnalyzeOnly),
     new OptionHandler(Flags.noSourceMaps, passThrough),
     new OptionHandler(Option.resolutionInput, setResolutionInput),
     new OptionHandler(Flags.resolveOnly, setResolveOnly),
     new OptionHandler(Flags.analyzeSignaturesOnly, setAnalyzeOnly),
     new OptionHandler(Flags.disableNativeLiveTypeAnalysis, passThrough),
     new OptionHandler('--categories=.*', setCategories),
+    new OptionHandler('--platform-config=.*', passThrough),
     new OptionHandler(Flags.disableTypeInference, implyCompilation),
     new OptionHandler(Flags.terse, passThrough),
     new OptionHandler('--deferred-map=.+', implyCompilation),
     new OptionHandler(Flags.dumpInfo, setDumpInfo),
     new OptionHandler(
         '--disallow-unsafe-eval', (_) => hasDisallowUnsafeEval = true),
     new OptionHandler(Option.showPackageWarnings, passThrough),
     new OptionHandler(Flags.useContentSecurityPolicy, passThrough),
     new OptionHandler(Flags.enableExperimentalMirrors, passThrough),
     new OptionHandler(Flags.enableAssertMessage, passThrough),
@@ skipping 610 matching lines @@
   @override
   void close() {
     // Do nothing.
   }
 
   @override
   void addError(errorEvent, [StackTrace stackTrace]) {
     // Ignore
   }
 }