Implement MethodMirror.location in the VM.

sdk/lib/mirrors/mirrors.dart

 // Copyright (c) 2013, 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.
 
 // For the purposes of the mirrors library, we adopt a naming
 // convention with respect to getters and setters.  Specifically, for
 // some variable or field...
 //
 //   var myField;
 //
@@ skipping 1065 matching lines @@
    * for an optional parameter, the default is [:null:] and a mirror on [:null:]
    * is returned.
    */
   InstanceMirror get defaultValue;
 }
 
 /**
  * A [SourceLocation] describes the span of an entity in Dart source code.
  */
 abstract class SourceLocation {
+  /**
+   * The 1-based line number for this source location.
+   *
+   * A value of 0 means that the line number is unknown.
+   */
+  int get line;
+
+  /**
+   * The 1-based column number for this source location.
+   *
+   * A value of 0 means that the column number is unknown.
+   */
+  int get column;
+
+  /**
+   * Returns the URI where the source originated.
+   */
+  Uri get sourceUri;
 }
 
 /**
  * Class used for encoding comments as metadata annotations.
  */
 class Comment {
   /**
    * The comment text as written in the source text.
    */
   final String text;
@@ skipping 108 matching lines @@
    *
    * When used as metadata on an import of "dart:mirrors", this metadata does
    * not apply to the library in which the annotation is used, but instead
    * applies to the other libraries (all libraries if "*" is used).
    */
   final override;
 
   const MirrorsUsed(
       {this.symbols, this.targets, this.metaTargets, this.override});
 }