[debugger] implement legacy debug event listeners via debug delegate.

src/inspector/v8-debugger.cc

Index: src/inspector/v8-debugger.cc
diff --git a/src/inspector/v8-debugger.cc b/src/inspector/v8-debugger.cc
index f332a57765c442ce438a32f820536137b3809f86..791518accc49929add3c0d6d9d0099b7078c92c0 100644
--- a/src/inspector/v8-debugger.cc
+++ b/src/inspector/v8-debugger.cc
@@ -628,7 +628,9 @@ void V8Debugger::BreakProgramRequested(v8::Local<v8::Context> pausedContext,
 void V8Debugger::ExceptionThrown(v8::Local<v8::Context> pausedContext,
                                  v8::Local<v8::Object> execState,
                                  v8::Local<v8::Value> exception,
-                                 bool isPromiseRejection, bool isUncaught) {
+                                 v8::Local<v8::Value> promise,
+                                 bool isUncaught) {
+  bool isPromiseRejection = promise->IsPromise();
   handleProgramBreak(pausedContext, execState, exception,
                      v8::Local<v8::Array>(), isPromiseRejection, isUncaught);
 }