Add --use-new-source-info option

tests/compiler/dart2js/sourcemaps/diff_view.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.
 
 library sourcemap.diff_view;
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
@@ skipping 53 matching lines @@
       currentOptions.add(arg);
     } else {
       filename = arg;
     }
   }
   List<String> commonArguments = optionSegments[0];
   List<List<String>> options = <List<String>>[];
   if (optionSegments.length == 1) {
     // Use default options; comparing SSA and CPS output using the new
     // source information strategy.
-    options.add([USE_NEW_SOURCE_INFO]..addAll(commonArguments));
-    options.add([USE_NEW_SOURCE_INFO, Flags.useCpsIr]..addAll(commonArguments));
+    options.add([Flags.useNewSourceInfo]..addAll(commonArguments));
+    options.add(
+        [Flags.useNewSourceInfo, Flags.useCpsIr]..addAll(commonArguments));
   } else if (optionSegments.length == 2) {
     // Use alternative options for the second output column.
     options.add(commonArguments);
     options.add(optionSegments[1]..addAll(commonArguments));
   } else {
     // Use specific options for both output columns.
     options.add(optionSegments[1]..addAll(commonArguments));
     options.add(optionSegments[2]..addAll(commonArguments));
   }
 
@@ skipping 366 matching lines @@
       });
       mappedNodes.add(node);
       return true;
     }
 
 
     for (TraceStep step in graph.steps) {
       String title = '${step.id}:${step.kind}:${step.offset}';
       if (!addSourceLocationsForNode(WITH_SOURCE_INFO, step.node, title)) {
         int offset;
-        if (options.contains(USE_NEW_SOURCE_INFO)) {
+        if (options.contains(Flags.useNewSourceInfo)) {
           offset = step.offset.subexpressionOffset;
         } else {
           offset = info.jsCodePositions[step.node].startPosition;
         }
         if (offset != null) {
           addAnnotation(WITHOUT_SOURCE_INFO, offset, title);
         }
       }
     }
     for (js.Node node in info.nodeMap.nodes) {
@@ skipping 86 matching lines @@
     kind = CodeKind.MEMBER;
     uri = astElement.compilationUnit.script.resourceUri;
     name = computeElementNameForSourceMaps(astElement);
     if (astElement.hasNode) {
       begin = astElement.node.getBeginToken().charOffset;
       end = astElement.node.getEndToken().charEnd;
     }
   }
   return new CodeSource(kind, uri, name, begin, end);
 }