Make CompilerTask independent of compiler.

pkg/compiler/lib/src/dump_info.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 dump_info;
 
 import 'dart:convert'
     show ChunkedConversionSink, JsonEncoder, StringConversionSink;
 
 import 'package:dart2js_info/info.dart';
@@ skipping 350 matching lines @@
 // TODO(sigmund,het): move more features here. Ideally the dump-info task
 // shouldn't reach into internals of other parts of the compiler. For example,
 // we currently reach into the full emitter and as a result we don't support
 // dump-info when using the startup-emitter (issue #24190).
 abstract class InfoReporter {
   void reportInlined(Element element, Element inlinedFrom);
 }
 
 class DumpInfoTask extends CompilerTask implements InfoReporter {
   static const ImpactUseCase IMPACT_USE = const ImpactUseCase('Dump info');
+  final Compiler compiler;
 
-  DumpInfoTask(Compiler compiler) : super(compiler);
+  DumpInfoTask(Compiler compiler)
+      : compiler = compiler,
+        super(compiler.measurer);
 
   String get name => "Dump Info";
 
   ElementInfoCollector infoCollector;
 
   /// The size of the generated output.
   int _programSize;
 
   // A set of javascript AST nodes that we care about the size of.
   // This set is automatically populated when registerElementAst()
@@ skipping 198 matching lines @@
         compilationMoment: new DateTime.now(),
         compilationDuration: compiler.measurer.wallClock.elapsed,
         toJsonDuration: stopwatch.elapsedMilliseconds,
         dumpInfoDuration: this.timing,
         noSuchMethodEnabled: compiler.backend.enabledNoSuchMethod,
         minified: compiler.options.enableMinification);
 
     ChunkedConversionSink<Object> sink = encoder.startChunkedConversion(
         new StringConversionSink.fromStringSink(buffer));
     sink.add(new AllInfoJsonCodec().encode(result));
-    reporter.reportInfo(NO_LOCATION_SPANNABLE, MessageKind.GENERIC, {
+    compiler.reporter.reportInfo(NO_LOCATION_SPANNABLE, MessageKind.GENERIC, {
       'text': "View the dumped .info.json file at "
           "https://dart-lang.github.io/dump-info-visualizer"
     });
   }
 }