Initial UserTag and dart:profiler library

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 536 matching lines @@
   friend class RawImmutableArray;
   friend class RawJSRegExp;
   friend class RawLibrary;
   friend class RawLiteralToken;
   friend class RawScript;
   friend class RawStacktrace;
   friend class RawTokenStream;
   friend class RawTypeArguments;
   friend class RawMirrorReference;
   friend class SnapshotWriterVisitor;
+  friend class RawUserTag;
   DISALLOW_COPY_AND_ASSIGN(SnapshotWriter);
 };
 
 
 class FullSnapshotWriter : public SnapshotWriter {
  public:
   static const intptr_t kInitialSize = 64 * KB;
   FullSnapshotWriter(uint8_t** buffer, ReAlloc alloc)
       : SnapshotWriter(Snapshot::kFull, buffer, alloc, kInitialSize) {
     ASSERT(buffer != NULL);
@@ skipping 63 matching lines @@
  private:
   SnapshotWriter* writer_;
   bool as_references_;
 
   DISALLOW_COPY_AND_ASSIGN(SnapshotWriterVisitor);
 };
 
 }  // namespace dart
 
 #endif  // VM_SNAPSHOT_H_