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..38b29166252caf49287d4f41d44c69fa1225cfeb 100644
--- a/runtime/bin/vmservice/vmservice_io.dart
+++ b/runtime/bin/vmservice/vmservice_io.dart
@@ -21,7 +21,7 @@ String _ip;
 bool _autoStart;
 // Should the HTTP server run in devmode?
 bool _originCheckDisabled;
-bool _isWindows = false;
+bool _hasSignals = true;

[Cutch, 2016/07/21 20:24:51]

This change is likely to break other embedders who set this flag from C++ code.

[zra, 2016/07/22 17:47:20]

Restored _isWindows. Added _isFuchsia.

 var _signalWatch;
 var _signalSubscription;
 
@@ -177,8 +177,8 @@ _registerSignalHandler() {
     // Cannot register for signals.
     return;
   }
-  if (_isWindows) {
-    // Cannot register for signals on Windows.
+  if (!_hasSignals) {
+    // Cannot register for signals on Windows or Fuchsia.
     return;
   }
   _signalSubscription = _signalWatch(ProcessSignal.SIGQUIT).listen(_onSignal);