Trigger debug event on not yet caught exception in promises.

include/v8-debug.h

 // Copyright 2008 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 25 matching lines @@
 namespace v8 {
 
 // Debug events which can occur in the V8 JavaScript engine.
 enum DebugEvent {
   Break = 1,
   Exception = 2,
   NewFunction = 3,
   BeforeCompile = 4,
   AfterCompile  = 5,
   ScriptCollected = 6,
-  BreakForCommand = 7
+  UncaughtExceptionInPromise = 7,
+  BreakForCommand = 8
 };
 
 
 class V8_EXPORT Debug {
  public:
   /**
    * A client object passed to the v8 debugger whose ownership will be taken by
    * it. v8 is always responsible for deleting the object.
    */
   class ClientData {
@@ skipping 279 matching lines @@
 };
 
 
 }  // namespace v8
 
 
 #undef EXPORT
 
 
 #endif  // V8_V8_DEBUG_H_