Add Dart_PropagateError.

runtime/vm/dart.cc

Index: runtime/vm/dart.cc
===================================================================
--- runtime/vm/dart.cc	(revision 3804)
+++ runtime/vm/dart.cc	(working copy)
@@ -10,7 +10,6 @@
 #include "vm/handles.h"
 #include "vm/heap.h"
 #include "vm/isolate.h"
-#include "vm/longjump.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/port.h"
@@ -63,7 +62,7 @@
 }
 
 
-void Dart::InitializeIsolate(const uint8_t* snapshot_buffer, void* data) {
+RawError* Dart::InitializeIsolate(const uint8_t* snapshot_buffer, void* data) {
   // Initialize the new isolate.
   TIMERSCOPE(time_isolate_initialization);
   Isolate* isolate = Isolate::Current();
@@ -74,7 +73,10 @@
   ObjectStore::Init(isolate);
 
   if (snapshot_buffer == NULL) {
-    Object::Init(isolate);
+    const Error& error = Error::Handle(Object::Init(isolate));
+    if (!error.IsNull()) {
+      return error.raw();
+    }
   } else {
     // Initialize from snapshot (this should replicate the functionality
     // of Object::Init(..) in a regular isolate creation path.
@@ -87,6 +89,7 @@
   StubCode::Init(isolate);
   CodeIndexTable::Init(isolate);
   isolate->set_init_callback_data(data);
+  return Error::null();
 }