Extend compiler API to support multiple outputs.

dart/sdk/lib/_internal/compiler/implementation/apiimpl.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 leg_apiimpl;
 
 import 'dart:uri';
 import 'dart:async';
 
 import '../compiler.dart' as api;
 import 'dart2jslib.dart' as leg;
 import 'tree/tree.dart' as tree;
 import 'elements/elements.dart' as elements;
 import 'ssa/tracer.dart' as ssa;
 import '../../libraries.dart';
 import 'source_file.dart';
 
 class Compiler extends leg.Compiler {
   api.ReadStringFromUri provider;
   api.DiagnosticHandler handler;
   final Uri libraryRoot;
   final Uri packageRoot;
   List<String> options;
   bool mockableLibraryUsed = false;
 
-  Compiler(this.provider, this.handler, this.libraryRoot, this.packageRoot,
+  Compiler(this.provider,
+           api.CompilerOutputProvider outputProvider,
+           this.handler,
+           this.libraryRoot,
+           this.packageRoot,
            List<String> options)
       : this.options = options,
         super(
             tracer: new ssa.HTracer(),
+            outputProvider: outputProvider,
             enableTypeAssertions: hasOption(options, '--enable-checked-mode'),
             enableUserAssertions: hasOption(options, '--enable-checked-mode'),
             enableMinification: hasOption(options, '--minify'),
             enableNativeLiveTypeAnalysis:
                 !hasOption(options, '--disable-native-live-type-analysis'),
             emitJavaScript: !hasOption(options, '--output-type=dart'),
             disallowUnsafeEval: hasOption(options, '--disallow-unsafe-eval'),
             analyzeAll: hasOption(options, '--analyze-all'),
             rejectDeprecatedFeatures:
                 hasOption(options, '--reject-deprecated-language-features'),
@@ skipping 144 matching lines @@
       handler(translateUri(span.uri, null), span.begin, span.end,
               message, kind);
     }
   }
 
   bool get isMockCompilation {
     return mockableLibraryUsed
       && (options.indexOf('--allow-mock-compilation') != -1);
   }
 }