Fix sticky error propagation from thread to isolate

runtime/vm/object_store.h

Index: runtime/vm/object_store.h
diff --git a/runtime/vm/object_store.h b/runtime/vm/object_store.h
index 92be955561599b0c55c3689fe4305c23b3f32d5f..ab2bd100f3712d51f605a0f1987e65d600ab5b53 100644
--- a/runtime/vm/object_store.h
+++ b/runtime/vm/object_store.h
@@ -365,6 +365,12 @@ class ObjectStore {
     return error_listeners_;
   }
 
+  // This sticky_error is used to preserve Thread::sticky_error_ after the
+  // mutator thread has been unscheduled.
+  RawError* sticky_error() const { return sticky_error_; }
+  void SetStickyErrorFromThread(const Thread* value);

[Ivan Posva, 2016/03/09 08:27:18]

Now we are putting functionality into the ObjectStore, please move this to
wherever this is being called. It is a single spot only as far as I can tell.

+  void clear_sticky_error() { sticky_error_ = Error::null(); }
+
   RawContext* empty_context() const { return empty_context_; }
   void set_empty_context(const Context& value) {
     empty_context_ = value.raw();
@@ -554,6 +560,7 @@ class ObjectStore {
   RawGrowableObjectArray* resume_capabilities_;
   RawGrowableObjectArray* exit_listeners_;
   RawGrowableObjectArray* error_listeners_;
+  RawError* sticky_error_;
   RawContext* empty_context_;
   RawInstance* stack_overflow_;
   RawInstance* out_of_memory_;