Fuchsia: Build standalone VM. Make it run "Hello, World!".

runtime/bin/eventhandler_fuchsia.h

Index: runtime/bin/eventhandler_fuchsia.h
diff --git a/runtime/bin/eventhandler_fuchsia.h b/runtime/bin/eventhandler_fuchsia.h
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+++ b/runtime/bin/eventhandler_fuchsia.h
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+// Copyright (c) 2016, 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 BIN_EVENTHANDLER_FUCHSIA_H_
+#define BIN_EVENTHANDLER_FUCHSIA_H_
+
+#if !defined(BIN_EVENTHANDLER_H_)
+#error Do not include eventhandler_fuchsia.h directly; use eventhandler.h instead.
+#endif
+
+#include <magenta/syscalls.h>
+
+namespace dart {
+namespace bin {
+
+class EventHandlerImplementation {
+ public:
+  EventHandlerImplementation();
+  ~EventHandlerImplementation();
+
+  void SendData(intptr_t id, Dart_Port dart_port, int64_t data);
+  void Start(EventHandler* handler);
+  void Shutdown();
+
+ private:
+  int64_t GetTimeout() const;
+  void HandleEvents();
+  void HandleTimeout();
+  void WakeupHandler(intptr_t id, Dart_Port dart_port, int64_t data);
+  void HandleInterruptFd();
+  static void Poll(uword args);
+
+  TimeoutQueue timeout_queue_;
+  bool shutdown_;
+  mx_handle_t interrupt_handles_[2];
+
+  DISALLOW_COPY_AND_ASSIGN(EventHandlerImplementation);
+};
+
+}  // namespace bin
+}  // namespace dart
+
+#endif  // BIN_EVENTHANDLER_FUCHSIA_H_