Fix Function.end_token_pos() and implement MethodMirror.source getter

sdk/lib/mirrors/mirrors.dart

 // 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.
 
 // 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 513 matching lines @@
  * A [ClosureMirror] provides access to its captured variables and
  * provides the ability to execute its reflectee.
  */
 abstract class ClosureMirror implements InstanceMirror {
   /**
    * A mirror on the function associated with this closure.
    */
   MethodMirror get function;
 
   /**
-   * The source code for this closure, if available.  Otherwise null.
-   *
-   * TODO(turnidge): Would this just be available in function?
-   */
-  String get source;
-
-  /**
    * Executes the closure and returns a mirror on the result.
    * Let *f* be the closure reflected by this mirror,
    * let *a1, ..., an* be the elements of [positionalArguments]
    * let *k1, ..., km* be the identifiers denoted by the elements of
    * [namedArguments.keys]
    * and let *v1, ..., vm* be the elements of [namedArguments.values].
    * Then this method will perform the method invocation
    *  *f(a1, ..., an, k1: v1, ..., km: vm)*
    * If the invocation returns a result *r*, this method returns
    * the result of calling [reflect](*r*).
@@ skipping 382 matching lines @@
  * A [MethodMirror] reflects a Dart language function, method,
  * constructor, getter, or setter.
  */
 abstract class MethodMirror implements DeclarationMirror {
   /**
    * A mirror on the return type for the reflectee.
    */
   TypeMirror get returnType;
 
   /**
+   * The source code for the reflectee, if available. Otherwise null.
+   */
+  String get source;
+
+  /**
    * A list of mirrors on the parameters for the reflectee.
    */
   List<ParameterMirror> get parameters;
 
   /**
    * Is the reflectee static?
    *
    * For the purposes of the mirrors library, a top-level function is
    * considered static.
    */
@@ skipping 353 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});
 }