Extract DiagnosticReporter implementation from Compiler.

pkg/compiler/lib/src/helpers/helpers.dart

 // Copyright (c) 2014, 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 for debugging helpers. The unittest analyze_unused_test checks that
 /// the helper are not used in production code.
 
 library dart2js.helpers;
 
 import 'dart:async' show
     EventSink;
 import 'dart:collection';
 import 'dart:convert';
 
 import '../../compiler.dart';
 import '../compiler.dart' show
     Compiler;
+import '../diagnostics/diagnostic_listener.dart' show
+    DiagnosticReporter;
 import '../diagnostics/invariant.dart' show
     DEBUG_MODE;
 import '../diagnostics/messages.dart' show
     MessageKind;
 import '../diagnostics/spannable.dart' show
     Spannable;
 import '../util/util.dart';
 
 part 'debug_collection.dart';
 part 'trace.dart';
@@ skipping 53 matching lines @@
   debugPrint('end:$s');
   return result;
 }
 
 /// Dummy method to mark breakpoints.
 debugBreak() {
   enableDebugMode();
 }
 
 /// Function signature of [reportHere].
-typedef ReportHere(Compiler compiler, Spannable node, String debugMessage);
+typedef ReportHere(DiagnosticReporter reporter,
+                   Spannable node,
+                   String debugMessage);
 
 /// Print a message with a source location.
 ReportHere get reportHere {
   enableDebugMode();
   return _reportHere;
 }
 
 /// Implementation of [reportHere]
-_reportHere(Compiler compiler, Spannable node, String debugMessage) {
-  compiler.reportInfo(node,
+_reportHere(DiagnosticReporter reporter, Spannable node, String debugMessage) {
+  reporter.reportInfo(node,
       MessageKind.GENERIC, {'text': 'HERE: $debugMessage'});
 }
 
 /// Set of tracked objects used by [track] and [ifTracked].
 var _trackedObjects = new Set();
 
 /// Global default value for the `printTrace` option of [track] and [ifTracked].
 bool trackWithTrace = false;
 
 /// If [doTrack] is `true`, add [object] to the set of tracked objects.
@@ skipping 31 matching lines @@
       if (printTrace) {
         trace(msg);
       } else {
         debugPrint(msg);
       }
     }
     return true;
   }
   return false;
 }