Make all DDC internal stack traces apply source maps.

pkg/dev_compiler/tool/input_sdk/private/debugger.dart

 // Copyright (c) 2015, 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 dart._debugger;
 
 import 'dart:_foreign_helper' show JS;
 import 'dart:_runtime' as dart;
 import 'dart:core';
 import 'dart:collection';
@@ skipping 832 matching lines @@
 class TypeFormatter implements Formatter {
   accept(object, config) => object is Type;
 
   String preview(object) => object.toString();
 
   bool hasChildren(object) => false;
 
   List<NameValuePair> children(object) => [];
 }
 
+typedef String StackTraceMapper(String stackTrace);
+
+/// Hook for other parts of the SDK To use to map JS stack traces to Dart
+/// stack traces.
+///
+/// Raw JS stack traces are used if $dartStackTraceUtility has not been
+/// specified.
+StackTraceMapper get stackTraceMapper {
+  var _util = JS('', r'dart.global.$dartStackTraceUtility');
+  return _util != null ? JS('StackTraceMapper', '#.mapper', _util) : null;
+}
+
 /// This entry point is automatically invoked by the code generated by
 /// Dart Dev Compiler
 registerDevtoolsFormatter() {
   var formatters = [_devtoolsFormatter];
   JS('', 'dart.global.devtoolsFormatters = #', formatters);
 }
 
 // Expose these methods here to facilitate writing debugger tests.
 // If export worked for private SDK libraries we could just export
 // these methods from dart:_runtime.
 
 getModuleNames() {
   return dart.getModuleNames();
 }
 
 getModuleLibraries(String name) {
   return dart.getModuleLibraries(name);
 }