Fixes to enable building dart io implementation in mojo tree

runtime/observatory/lib/src/service/object.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.
 
 part of service;
 
 /// A [ServiceObject] represents a persistent object within the vm.
 abstract class ServiceObject extends Observable {
   static int LexicalSortName(ServiceObject o1, ServiceObject o2) {
     return o1.name.compareTo(o2.name);
@@ skipping 2157 matching lines @@
   String toString() => "CallSiteEntry(${receiverContainer.name}, $count)";
 }
 
 class Script extends ServiceObject with Coverage {
   Set<CallSite> callSites = new Set<CallSite>();
   final lines = new ObservableList<ScriptLine>();
   final _hits = new Map<int, int>();
   @observable String kind;
   @observable int firstTokenPos;
   @observable int lastTokenPos;
+  @observable int lineOffset;
+  @observable int columnOffset;
   @observable Library library;
   bool get canCache => true;
   bool get immutable => true;
 
   String _shortUrl;
   String _url;
 
   Script._empty(ServiceObjectOwner owner) : super._empty(owner);
 
   ScriptLine getLine(int line) {
     assert(line >= 1);
-    return lines[line - 1];
+    return lines[line - lineOffset - 1];
   }
 
   /// This function maps a token position to a line number.
   int tokenToLine(int token) => _tokenToLine[token];
   Map _tokenToLine = {};
 
   /// This function maps a token position to a column number.
   int tokenToCol(int token) => _tokenToCol[token];
   Map _tokenToCol = {};
 
   void _update(ObservableMap map, bool mapIsRef) {
     _upgradeCollection(map, isolate);
     kind = map['kind'];
     _url = map['name'];
     _shortUrl = _url.substring(_url.lastIndexOf('/') + 1);
     name = _shortUrl;
     vmName = _url;
     if (mapIsRef) {
       return;
     }
+    lineOffset = map['lineOffset'];
+    columnOffset = map['columnOffset'];
     _parseTokenPosTable(map['tokenPosTable']);
     _processSource(map['source']);
     library = map['library'];
   }
 
   void _parseTokenPosTable(List<List<int>> table) {
     if (table == null) {
       return;
     }
     _tokenToLine.clear();
@@ skipping 65 matching lines @@
     }
     var sourceLines = source.split('\n');
     if (sourceLines.length == 0) {
       return;
     }
     // We have the source to the script. This is now loaded.
     _loaded = true;
     lines.clear();
     Logger.root.info('Adding ${sourceLines.length} source lines for ${_url}');
     for (var i = 0; i < sourceLines.length; i++) {
-      lines.add(new ScriptLine(this, i + 1, sourceLines[i]));
+      lines.add(new ScriptLine(this, i + lineOffset + 1, sourceLines[i]));
     }
     for (var bpt in isolate.breakpoints.values) {
       if (bpt.script == this) {
         _addBreakpoint(bpt);
       }
     }
 
     _applyHitsToLines();
     // Notify any Observers that this Script's state has changed.
     notifyChange(null);
@@ skipping 685 matching lines @@
     var v = list[i];
     if ((v is ObservableMap) && _isServiceMap(v)) {
       list[i] = owner.getFromMap(v);
     } else if (v is ObservableList) {
       _upgradeObservableList(v, owner);
     } else if (v is ObservableMap) {
       _upgradeObservableMap(v, owner);
     }
   }
 }