Support VTune's JIT interface.

runtime/vm/vtune.h

Index: runtime/vm/vtune.h
diff --git a/runtime/vm/vtune.h b/runtime/vm/vtune.h
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index 0000000000000000000000000000000000000000..4f62aff51422447a5b326d952349ab21dc4b1d34
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+++ b/runtime/vm/vtune.h
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+// 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_VTUNE_H_
+#define VM_VTUNE_H_
+
+#include "vm/code_observers.h"
+
+namespace dart {
+
+#if defined(DART_VTUNE_SUPPORT)
+class VTuneCodeObserver : public CodeObserver {
+ public:
+  virtual bool IsActive() const;
+
+  virtual void Notify(const char* name,
+                      uword base,
+                      uword prologue_offset,
+                      uword size,
+                      bool optimized);
+};
+#endif
+
+
+}  // namespace dart
+
+#endif  // VM_VTUNE_H_