Introduce "platform configurations" to replace categories and libraries.dart.

pkg/dart2js_incremental/lib/caching_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.
 
 part of dart2js_incremental;
 
 /// Do not call this method directly. It will be made private.
 // TODO(ahe): Make this method private.
 Future<CompilerImpl> reuseCompiler(
     {CompilerDiagnostics diagnosticHandler,
@@ skipping 58 matching lines @@
 
     // Much like a scout, an incremental compiler is always prepared. For
     // mixins, classes, and lazy statics, at least.
     emitter
         ..needsClassSupport = true
         ..needsMixinSupport = true
         ..needsLazyInitializer = true
         ..needsStructuredMemberInfo = true;
 
     Uri core = Uri.parse("dart:core");
-    return compiler.libraryLoader.loadLibrary(core).then((_) {
-      // Likewise, always be prepared for runtimeType support.
-      // TODO(johnniwinther): Add global switch to force RTI.
-      compiler.enabledRuntimeType = true;
-      backend.registerRuntimeType(
-          compiler.enqueuer.resolution, compiler.globalDependencies);
-      return compiler;
+
+    return compiler.setupSdk().then((_) {
+      return compiler.libraryLoader.loadLibrary(core).then((_) {
+        // Likewise, always be prepared for runtimeType support.
+        // TODO(johnniwinther): Add global switch to force RTI.
+        compiler.enabledRuntimeType = true;
+        backend.registerRuntimeType(
+            compiler.enqueuer.resolution, compiler.globalDependencies);
+        return compiler;
+      });
     });
   } else {
     for (final task in compiler.tasks) {
       if (task.watch != null) {
         task.watch.reset();
       }
     }
     compiler
         ..userOutputProvider = outputProvider
         ..provider = inputProvider
@@ skipping 93 matching lines @@
   final Map<String, String> output = new Map<String, String>();
 
   EventSink<String> createEventSink(String name, String extension) {
     return new StringEventSink((String data) {
       output['$name.$extension'] = data;
     });
   }
 
   String operator[] (String key) => output[key];
 }