Rework service extensions to be safe

runtime/vm/symbols.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_SYMBOLS_H_
 #define VM_SYMBOLS_H_
 
 #include "vm/growable_array.h"
 #include "vm/object.h"
 #include "vm/snapshot_ids.h"
@@ skipping 379 matching lines @@
   V(position_registers, ":position_registers")                                 \
   V(string_param, ":string_param")                                             \
   V(start_index_param, ":start_index_param")                                   \
   V(clear, "clear")                                                            \
   V(_wordCharacterMap, "_wordCharacterMap")                                    \
   V(print, "print")                                                            \
   V(last, "last")                                                              \
   V(removeLast, "removeLast")                                                  \
   V(add, "add")                                                                \
   V(ConstructorClosurePrefix, "new#")                                          \
-  V(_scheduleExtension, "_scheduleExtension")                                  \
+  V(_runExtension, "_runExtension")                                            \
+  V(_runPendingImmediateCallback, "_runPendingImmediateCallback")              \
 
 
 // Contains a list of frequently used strings in a canonicalized form. This
 // list is kept in the vm_isolate in order to share the copy across isolates
 // without having to maintain copies in each isolate.
 class Symbols : public AllStatic {
  public:
   enum { kMaxOneCharCodeSymbol = 0xFF };
 
   // List of strings that are pre created in the vm isolate.
@@ skipping 230 matching lines @@
   friend class SnapshotReader;
   friend class SnapshotWriter;
   friend class ApiMessageReader;
 
   DISALLOW_COPY_AND_ASSIGN(Symbols);
 };
 
 }  // namespace dart
 
 #endif  // VM_SYMBOLS_H_