Changes to prepare for allowing script snapshots to be taken after running the main application

runtime/vm/snapshot.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_SNAPSHOT_H_
 #define VM_SNAPSHOT_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/bitfield.h"
@@ skipping 820 matching lines @@
   Exceptions::ExceptionType exception_type_;  // Exception type.
   const char* exception_msg_;  // Message associated with exception.
   bool unmarked_objects_;  // True if marked objects have been unmarked.
   bool can_send_any_object_;  // True if any Dart instance can be sent.
   bool snapshot_code_;
 
   friend class FullSnapshotWriter;
   friend class RawArray;
   friend class RawClass;
   friend class RawClosureData;
+  friend class RawContextScope;
   friend class RawExceptionHandlers;
   friend class RawGrowableObjectArray;
   friend class RawImmutableArray;
   friend class RawInstructions;
   friend class RawJSRegExp;
   friend class RawLibrary;
   friend class RawLinkedHashMap;
   friend class RawLiteralToken;
   friend class RawLocalVarDescriptors;
   friend class RawMirrorReference;
@@ skipping 119 matching lines @@
  private:
   SnapshotWriter* writer_;
   bool as_references_;
 
   DISALLOW_COPY_AND_ASSIGN(SnapshotWriterVisitor);
 };
 
 }  // namespace dart
 
 #endif  // VM_SNAPSHOT_H_