Dev compiler debugger related tweaks.

pkg/dev_compiler/lib/src/compiler/compiler.dart

 // Copyright (c) 2016, 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.
 
 import 'dart:collection' show HashSet, Queue;
 import 'dart:convert' show JSON;
 import 'dart:io' show File;
 
 import 'package:analyzer/analyzer.dart'
     show AnalysisError, CompilationUnit, ErrorSeverity;
@@ skipping 480 matching lines @@
 
     var tree =
         transformModuleFormat(format, moduleTree, singleOutFile: singleOutFile);
     tree.accept(
         new JS.Printer(opts, printer, localNamer: new JS.TemporaryNamer(tree)));
 
     Map builtMap;
     if (options.sourceMap && sourceMap != null) {
       builtMap =
           placeSourceMap(sourceMap.build(jsUrl), mapUrl, options.bazelMapping);
-      if (name == 'dart_sdk') {
-        builtMap = cleanupSdkSourcemap(builtMap);
-      }
       if (options.sourceMapComment) {
         var relativeMapUrl = path
             .toUri(
                 path.relative(path.fromUri(mapUrl), from: path.dirname(jsUrl)))
             .toString();
         assert(path.dirname(jsUrl) == path.dirname(mapUrl));
         printer.emit('\n//# sourceMappingURL=');
         printer.emit(relativeMapUrl);
         printer.emit('\n');
       }
@@ skipping 65 matching lines @@
 /// Adjusts the source paths in [sourceMap] to be relative to [sourceMapPath],
 /// and returns the new map.
 // TODO(jmesserly): find a new home for this.
 Map placeSourceMap(
     Map sourceMap, String sourceMapPath, Map<String, String> bazelMappings) {
   var dir = path.dirname(sourceMapPath);
   var map = new Map.from(sourceMap);
   var list = new List.from(map['sources']);
   map['sources'] = list;
   String transformUri(String uri) {
+    if (uri.startsWith('dart:')) return uri;
     var match = bazelMappings[path.absolute(uri)];
     if (match != null) return match;
 
     // Fall back to a relative path.
     return path.toUri(path.relative(path.fromUri(uri), from: dir)).toString();
   }
 
   for (int i = 0; i < list.length; i++) {
     list[i] = transformUri(list[i]);
   }
   map['file'] = transformUri(map['file']);
   return map;
 }
-
-/// Cleanup the dart_sdk source map.
-///
-/// Strip out files that should not be included in the sdk sourcemap as they
-/// are implementation details that would just confuse users.
-/// Normalize sdk urls to use "dart:" for more understandable stack traces.
-Map cleanupSdkSourcemap(Map sourceMap) {
-  var map = new Map.from(sourceMap);
-  map['sources'] = map['sources']
-      .map((url) => url.contains('/_internal/') ? null : url)
-      .toList();
-  return map;
-}