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

pkg/compiler/lib/src/compiler.dart

 // Copyright (c) 2012, 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.compiler_base;
 
 import 'dart:async' show
     EventSink,
     Future;
 
@@ skipping 911 matching lines @@
     }
     if (errorElement != null &&
         errorElement.isSynthesized &&
         !mainApp.isSynthesized) {
       reporter.reportWarningMessage(
           errorElement, errorElement.messageKind,
           errorElement.messageArguments);
     }
   }
 
-  /// Analyze all member of the library in [libraryUri].
+  /// Analyze all members of the library in [libraryUri].
   ///
   /// If [skipLibraryWithPartOfTag] is `true`, member analysis is skipped if the
   /// library has a `part of` tag, assuming it is a part and not a library.
   ///
   /// This operation assumes an unclosed resolution queue and is only supported
   /// when the '--analyze-main' option is used.
   Future<LibraryElement> analyzeUri(
       Uri libraryUri,
       {bool skipLibraryWithPartOfTag: true}) {
     assert(analyzeMain);
@@ skipping 1108 matching lines @@
     if (_otherDependencies == null) {
       _otherDependencies = new Setlet<Element>();
     }
     _otherDependencies.add(element.implementation);
   }
 
   Iterable<Element> get otherDependencies {
     return _otherDependencies != null ? _otherDependencies : const <Element>[];
   }
 }