Account for empty stack trace with non-empty async chain in V8Initializer.

third_party/WebKit/Source/bindings/core/v8/V8Initializer.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 80 matching lines @@
 static void reportFatalErrorInMainThread(const char* location, const char* message)
 {
     int memoryUsageMB = Platform::current()->actualMemoryUsageMB();
     printf("V8 error: %s (%s).  Current memory usage: %d MB\n", message, location, memoryUsageMB);
     CRASH();
 }
 
 static PassRefPtr<ScriptCallStack> extractCallStack(v8::Isolate* isolate, v8::Local<v8::Message> message, int* const scriptId)
 {
     v8::Local<v8::StackTrace> stackTrace = message->GetStackTrace();
-    RefPtr<ScriptCallStack> callStack = nullptr;
+    RefPtr<ScriptCallStack> callStack = ScriptCallStack::create(isolate, stackTrace);
     *scriptId = message->GetScriptOrigin().ScriptID()->Value();
-    // Currently stack trace is only collected when inspector is open.
     if (!stackTrace.IsEmpty() && stackTrace->GetFrameCount() > 0) {
-        callStack = ScriptCallStack::create(isolate, stackTrace);
         int topScriptId = stackTrace->GetFrame(0)->GetScriptId();
         if (topScriptId == *scriptId)
             *scriptId = 0;
     }
     return callStack.release();
 }
 
 static String extractResourceName(v8::Local<v8::Message> message, const ExecutionContext* context)
 {
     v8::Local<v8::Value> resourceName = message->GetScriptOrigin().ResourceName();
@@ skipping 356 matching lines @@
 
     isolate->AddMessageListener(messageHandlerInWorker);
     isolate->SetFatalErrorHandler(reportFatalErrorInWorker);
 
     uint32_t here;
     isolate->SetStackLimit(reinterpret_cast<uintptr_t>(&here - kWorkerMaxStackSize / sizeof(uint32_t*)));
     isolate->SetPromiseRejectCallback(promiseRejectHandlerInWorker);
 }
 
 } // namespace blink