Trigger debug event on not yet caught exception in promises.

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1037 matching lines @@
   bool try_catch_needs_message =
       can_be_caught_externally && try_catch_handler()->capture_message_ &&
       !thread_local_top()->rethrowing_message_;
   bool bootstrapping = bootstrapper()->IsActive();
 
   thread_local_top()->rethrowing_message_ = false;
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
   // Notify debugger of exception.
   if (catchable_by_javascript) {
-    debugger_->OnException(exception_handle, report_exception);
+    debugger_->OnException(
+        exception_handle, report_exception, factory()->undefined_value());
   }
 #endif
 
   // Generate the message if required.
   if (report_exception || try_catch_needs_message) {
     MessageLocation potential_computed_location;
     if (location == NULL) {
       // If no location was specified we use a computed one instead.
       ComputeLocation(&potential_computed_location);
       location = &potential_computed_location;
@@ skipping 1181 matching lines @@
       Handle<JSObject> obj = factory()->NewJSObjectFromMap(map);
       JSObject::NormalizeProperties(obj, KEEP_INOBJECT_PROPERTIES, 8);
       JSObject::SetProperty(registry, name, obj, NONE, STRICT).Assert();
     }
   }
   return Handle<JSObject>::cast(factory()->symbol_registry());
 }
 
 
 } }  // namespace v8::internal