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

runtime/vm/bootstrap_natives.h

 // 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.
 
 #ifndef VM_BOOTSTRAP_NATIVES_H_
 #define VM_BOOTSTRAP_NATIVES_H_
 
 #include "vm/native_entry.h"
 
 // bootstrap dart natives used in the core dart library.
@@ skipping 265 matching lines @@
   V(LibraryMirror_invokeSetter, 4)                                             \
   V(TypeVariableMirror_owner, 1)                                               \
   V(TypeVariableMirror_upper_bound, 1)                                         \
   V(DeclarationMirror_metadata, 1)                                             \
   V(FunctionTypeMirror_call_method, 2)                                         \
   V(FunctionTypeMirror_parameters, 2)                                          \
   V(FunctionTypeMirror_return_type, 1)                                         \
   V(MethodMirror_owner, 1)                                                     \
   V(MethodMirror_parameters, 2)                                                \
   V(MethodMirror_return_type, 1)                                               \
+  V(MethodMirror_source, 1)                                                    \
   V(ParameterMirror_type, 2)                                                   \
   V(TypedefMirror_referent, 1)                                                 \
   V(VariableMirror_type, 1)                                                    \
   V(GrowableObjectArray_allocate, 2)                                           \
   V(GrowableObjectArray_getIndexed, 2)                                         \
   V(GrowableObjectArray_setIndexed, 3)                                         \
   V(GrowableObjectArray_getLength, 1)                                          \
   V(GrowableObjectArray_getCapacity, 1)                                        \
   V(GrowableObjectArray_setLength, 2)                                          \
   V(GrowableObjectArray_setData, 2)                                            \
@@ skipping 11 matching lines @@
   static void DN_##name(Dart_NativeArguments args);
 
   BOOTSTRAP_NATIVE_LIST(DECLARE_BOOTSTRAP_NATIVE)
 
 #undef DECLARE_BOOTSTRAP_NATIVE
 };
 
 }  // namespace dart
 
 #endif  // VM_BOOTSTRAP_NATIVES_H_