Added support for isolate unhandled exceptions.

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index 88d0389e57560cb003aac5c0a69429c8cb73481e..31446390ce1a3dfa8bcef29cc3e3904e3d517a9f 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -736,10 +736,12 @@ DART_EXPORT const char* Dart_VersionString() {
   return Version::String();
 }
 
-DART_EXPORT bool Dart_Initialize(Dart_IsolateCreateCallback create,
-                                 Dart_IsolateInterruptCallback interrupt,
-                                 Dart_IsolateShutdownCallback shutdown) {
-  return Dart::InitOnce(create, interrupt, shutdown);
+DART_EXPORT bool Dart_Initialize(
+    Dart_IsolateCreateCallback create,
+    Dart_IsolateInterruptCallback interrupt,
+    Dart_IsolateUnhandledExceptionCallback unhandled,
+    Dart_IsolateShutdownCallback shutdown) {
+  return Dart::InitOnce(create, interrupt, unhandled, shutdown);
 }
 
 DART_EXPORT bool Dart_SetVMFlags(int argc, const char** argv) {