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

src/debug.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_DEBUG_H_
 #define V8_DEBUG_H_
 
 #include "src/allocation.h"
 #include "src/arguments.h"
 #include "src/assembler.h"
@@ skipping 327 matching lines @@
 //
 // This class controls the debug info for all functions which currently have
 // active breakpoints in them. This debug info is held in the heap root object
 // debug_info which is a FixedArray. Each entry in this list is of class
 // DebugInfo.
 class Debug {
  public:
   // Debug event triggers.
   void OnDebugBreak(Handle<Object> break_points_hit, bool auto_continue);
 
-  void OnThrow(Handle<Object> exception, bool uncaught);
+  void OnThrow(Handle<Object> exception, Handle<Object> promise, bool uncaught);
   void OnPromiseReject(Handle<JSObject> promise, Handle<Object> value);
   void OnCompileError(Handle<Script> script);
   void OnBeforeCompile(Handle<Script> script);
   void OnAfterCompile(Handle<Script> script);
   void OnPromiseEvent(Handle<JSObject> data);
   void OnAsyncTaskEvent(Handle<JSObject> data);
 
   // API facing.
   void SetEventListener(Handle<Object> callback, Handle<Object> data);
   void SetMessageHandler(v8::Debug::MessageHandler handler);
@@ skipping 163 matching lines @@
   MUST_USE_RESULT MaybeHandle<Object> MakeCompileEvent(
       Handle<Script> script, v8::DebugEvent type);
   MUST_USE_RESULT MaybeHandle<Object> MakePromiseEvent(
       Handle<JSObject> promise_event);
   MUST_USE_RESULT MaybeHandle<Object> MakeAsyncTaskEvent(
       Handle<JSObject> task_event);
 
   // Mirror cache handling.
   void ClearMirrorCache();
 
-  // Returns a promise if the pushed try-catch handler matches the current one.
-  bool PromiseHasRejectHandler(Handle<JSObject> promise);
-
   void CallEventCallback(v8::DebugEvent event,
                          Handle<Object> exec_state,
                          Handle<Object> event_data,
                          v8::Debug::ClientData* client_data);
   void ProcessDebugEvent(v8::DebugEvent event,
                          Handle<JSObject> event_data,
                          bool auto_continue);
   void NotifyMessageHandler(v8::DebugEvent event,
                             Handle<JSObject> exec_state,
                             Handle<JSObject> event_data,
@@ skipping 193 matching lines @@
   // several frames above.
   // There is no calling conventions here, because it never actually gets
   // called, it only gets returned to.
   static void GenerateFrameDropperLiveEdit(MacroAssembler* masm);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_DEBUG_H_