Fix sticky error propagation from thread to isolate

runtime/vm/object_store.cc

Index: runtime/vm/object_store.cc
diff --git a/runtime/vm/object_store.cc b/runtime/vm/object_store.cc
index a0feb38bb8eea238f547e4fc1fe72a674e12dda4..91e3f1ae0be2c31cc30a24f4245e566fc83e4886 100644
--- a/runtime/vm/object_store.cc
+++ b/runtime/vm/object_store.cc
@@ -79,6 +79,7 @@ ObjectStore::ObjectStore()
     resume_capabilities_(GrowableObjectArray::null()),
     exit_listeners_(GrowableObjectArray::null()),
     error_listeners_(GrowableObjectArray::null()),
+    sticky_error_(Error::null()),
     empty_context_(Context::null()),
     stack_overflow_(Instance::null()),
     out_of_memory_(Instance::null()),
@@ -105,6 +106,17 @@ ObjectStore::~ObjectStore() {
 }
 
 
+void ObjectStore::SetStickyErrorFromThread(const Thread* thread) {
+  ASSERT(thread->IsMutatorThread());
+  if (thread->sticky_error() == Error::null()) {
+    return;
+  }
+  // Protect overwriting valid error.
+  ASSERT(sticky_error_ == Error::null());
+  sticky_error_ = thread->sticky_error();
+}
+
+
 void ObjectStore::VisitObjectPointers(ObjectPointerVisitor* visitor) {
   ASSERT(visitor != NULL);
   visitor->VisitPointers(from(), to());