Report promise reject with no handler (behind a flag).

src/isolate.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include "include/v8-debug.h"
 #include "src/allocation.h"
 #include "src/assert-scope.h"
@@ skipping 760 matching lines @@
   void RestorePendingMessageFromTryCatch(v8::TryCatch* handler);
   // Un-schedule an exception that was caught by a TryCatch handler.
   void CancelScheduledExceptionFromTryCatch(v8::TryCatch* handler);
   void ReportPendingMessages();
   // Return pending location if any or unfilled structure.
   MessageLocation GetMessageLocation();
   Object* ThrowIllegalOperation();
 
   // Promote a scheduled exception to pending. Asserts has_scheduled_exception.
   Object* PromoteScheduledException();
+
+  Handle<JSMessageObject> CreateMessage(
+      Handle<Object> exception, MessageLocation* location,
+      Handle<JSObject> promise = Handle<JSObject>());
+
   void DoThrow(Object* exception, MessageLocation* location);
   // Checks if exception should be reported and finds out if it's
   // caught externally.
   bool ShouldReportException(bool* can_be_caught_externally,
                              bool catchable_by_javascript);
 
+  void ReportPromiseReject(Handle<JSObject> promise, Handle<Object> exception,
+                           MessageLocation* location);
+
   // Attempts to compute the current source location, storing the
   // result in the target out parameter.
   void ComputeLocation(MessageLocation* target);
 
   // Out of resource exception helpers.
   Object* StackOverflow();
   Object* TerminateExecution();
   void CancelTerminateExecution();
 
   void InvokeApiInterruptCallback();
@@ skipping 752 matching lines @@
   }
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_