Fixes to enable building dart io implementation in mojo tree

runtime/vm/object.cc

 // Copyright (c) 2012, 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.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 8534 matching lines @@
   intptr_t lib_index = (lib.IsNull()) ? -1 : lib.index();
   jsobj.AddPropertyF("id", "libraries/%" Pd "/scripts/%s",
       lib_index, encoded_url.ToCString());
   jsobj.AddPropertyStr("name", name);
   jsobj.AddProperty("kind", GetKindAsCString());
   if (ref) {
     return;
   }
   jsobj.AddProperty("library", lib);
   const String& source = String::Handle(Source());
+  jsobj.AddProperty("lineOffset", line_offset());
+  jsobj.AddProperty("columnOffset", col_offset());
   jsobj.AddPropertyStr("source", source);
 
   // Print the line number table
   {
     JSONArray tokenPosTable(&jsobj, "tokenPosTable");
 
     const GrowableObjectArray& lineNumberArray =
         GrowableObjectArray::Handle(GenerateLineNumberArray());
     Object& value = Object::Handle();
     intptr_t pos = 0;
@@ skipping 12148 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart