Make lines and columns one-based in SourceLocation.

pkg/compiler/lib/src/io/start_end_information.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.
 
 /// Source information system that maps spans of Dart AST nodes to spans of
 /// JavaScript nodes.
 
 library dart2js.source_information.start_end;
 
 import 'package:front_end/src/fasta/scanner.dart' show Token;
@@ skipping 73 matching lines @@
       endSourcePosition = new OffsetSourceLocation(sourceFile, end, name);
     }
     return new StartEndSourceInformation(sourcePosition, endSourcePosition);
   }
 
   /// Create a textual representation of the source information using [uriText]
   /// as the Uri representation.
   String _computeText(String uriText) {
     StringBuffer sb = new StringBuffer();
     sb.write('$uriText:');
-    // Use 1-based line/startPosition info to match usual dart tool output.
-    sb.write('[${startPosition.line + 1},${startPosition.column + 1}]');
+    sb.write('[${startPosition.line},${startPosition.column}]');
     if (endPosition != null) {
-      sb.write('-[${endPosition.line + 1},${endPosition.column + 1}]');
+      sb.write('-[${endPosition.line},${endPosition.column}]');
     }
     return sb.toString();
   }
 
   String get shortText {
     return _computeText(startPosition.sourceUri.pathSegments.last);
   }
 
   String toString() {
     return _computeText('${startPosition.sourceUri}');
@@ skipping 144 matching lines @@
 
   @override
   SourceInformation buildIf(Node node) => buildGeneric(node);
 
   @override
   SourceInformationBuilder forContext(ResolvedAst resolvedAst,
       {SourceInformation sourceInformation}) {
     return new StartEndSourceInformationBuilder(resolvedAst);
   }
 }