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

runtime/bin/vmservice/vmservice_io.dart

Index: runtime/bin/vmservice/vmservice_io.dart
diff --git a/runtime/bin/vmservice/vmservice_io.dart b/runtime/bin/vmservice/vmservice_io.dart
index 680766a00825df177b6329a315b7cfd71b04b9f2..4e5ccabf2a75663afa54f3ba5bbaf5ac699cb7a9 100644
--- a/runtime/bin/vmservice/vmservice_io.dart
+++ b/runtime/bin/vmservice/vmservice_io.dart
@@ -22,6 +22,7 @@ bool _autoStart;
 // Should the HTTP server run in devmode?
 bool _originCheckDisabled;
 bool _isWindows = false;
+bool _isFuchsia = false;
 var _signalWatch;
 var _signalSubscription;
 
@@ -177,8 +178,8 @@ _registerSignalHandler() {
     // Cannot register for signals.
     return;
   }
-  if (_isWindows) {
-    // Cannot register for signals on Windows.
+  if (_isWindows || _isFuchsia) {
+    // Cannot register for signals on Windows or Fuchsia.
     return;
   }
   _signalSubscription = _signalWatch(ProcessSignal.SIGQUIT).listen(_onSignal);