Support loading binary data in dart2js

pkg/compiler/lib/src/platform_configuration.dart

 // Copyright (c) 2015, the Fletch 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.md file.
 
 /// Tools for loading and parsing platform-configuration files.
-library plaform_configuration;
+library platform_configuration;
 
 import "dart:async";
 
 import "package:charcode/ascii.dart";
 
 import "../compiler_new.dart" as api;
 
 /// Parses an Ini-like format.
 ///
 /// Sections are initialized with a name enclosed in brackets.
@@ skipping 109 matching lines @@
   sections[librariesSection].forEach((String name, String value) {
     result[name] = baseLocation.resolve(value);
   });
   return result;
 }
 
 final Set<String> allowedSections =
     new Set.from([librariesSection, dartSpecSection, featuresSection]);
 
 Future<Map<String, Uri>> load(Uri location, api.CompilerInput provider) {
-  return provider.readFromUri(location).then((contents) {
-    if (contents is String) {
-      contents = contents.codeUnits;
-    }
+  return provider
+      .readFromUri(location, inputKind: api.InputKind.binary)
+      .then((api.Input<List<int>> input) {
     return libraryMappings(
-        parseIni(contents,
+        parseIni(input.data,
             allowedSections: allowedSections, sourceUri: location),
         location);
   });
 }