- Add a minimal implementation of Capability.

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 39 matching lines @@
 class RawLibrary;
 class RawLibraryPrefix;
 class RawNamespace;
 class RawLiteralToken;
 class RawMint;
 class RawObject;
 class RawOneByteString;
 class RawPatchClass;
 class RawScript;
 class RawSmi;
+class RawCapability;
+class RawReceivePort;
+class RawSendPort;

[siva, 2014/04/23 00:20:31]

Why are these forward declarations needed here?

 class RawStacktrace;
 class RawTokenStream;
 class RawType;
 class RawTypeRef;
 class RawTypeParameter;
 class RawTypeArguments;
 class RawTwoByteString;
 class RawUnresolvedClass;
 class String;
 class TokenStream;
@@ skipping 561 matching lines @@
  private:
   SnapshotWriter* writer_;
   bool as_references_;
 
   DISALLOW_COPY_AND_ASSIGN(SnapshotWriterVisitor);
 };
 
 }  // namespace dart
 
 #endif  // VM_SNAPSHOT_H_