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

src/inspector/v8-debugger.cc

 // Copyright 2016 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.
 
 #include "src/inspector/v8-debugger.h"
 
 #include "src/inspector/debugger-script.h"
 #include "src/inspector/inspected-context.h"
 #include "src/inspector/protocol/Protocol.h"
 #include "src/inspector/script-breakpoint.h"
@@ skipping 610 matching lines @@
     return;
   }
   DCHECK(hitBreakpoints->IsArray());
   handleProgramBreak(pausedContext, execState, v8::Local<v8::Value>(),
                      hitBreakpoints.As<v8::Array>());
 }
 
 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);
 }
 
 bool V8Debugger::IsFunctionBlackboxed(v8::Local<v8::debug::Script> script,
                                       const v8::debug::Location& start,
                                       const v8::debug::Location& end) {
   V8DebuggerAgentImpl* agent = agentForScript(m_inspector, script);
   if (!agent) return false;
   return agent->isFunctionBlackboxed(String16::fromInteger(script->Id()), start,
@@ skipping 335 matching lines @@
 
   size_t stackSize =
       fullStack ? V8StackTraceImpl::maxCallStackSizeToCapture : 1;
   if (m_inspector->enabledRuntimeAgentForGroup(contextGroupId))
     stackSize = V8StackTraceImpl::maxCallStackSizeToCapture;
 
   return V8StackTraceImpl::capture(this, contextGroupId, stackSize);
 }
 
 }  // namespace v8_inspector