Added support for isolate unhandled exceptions.

runtime/vm/dart.cc

Index: runtime/vm/dart.cc
diff --git a/runtime/vm/dart.cc b/runtime/vm/dart.cc
index 99e2886a46d482a0cb73d713f407df54e438b5b0..aa83a2a145688b793ab75d8909e7736d9e2084d1 100644
--- a/runtime/vm/dart.cc
+++ b/runtime/vm/dart.cc
@@ -50,6 +50,7 @@ class PremarkingVisitor : public ObjectVisitor {
 // TODO(turnidge): We should add a corresponding Dart::Cleanup.
 bool Dart::InitOnce(Dart_IsolateCreateCallback create,
                     Dart_IsolateInterruptCallback interrupt,
+                    Dart_IsolateUnhandledExceptionCallback unhandled,
                     Dart_IsolateShutdownCallback shutdown) {
   // TODO(iposva): Fix race condition here.
   if (vm_isolate_ != NULL || !Flags::Initialized()) {
@@ -88,6 +89,7 @@ bool Dart::InitOnce(Dart_IsolateCreateCallback create,
   Isolate::SetCurrent(NULL);  // Unregister the VM isolate from this thread.
   Isolate::SetCreateCallback(create);
   Isolate::SetInterruptCallback(interrupt);
+  Isolate::SetUnhandledExceptionCallback(unhandled);
   Isolate::SetShutdownCallback(shutdown);
   return true;
 }