Speculative Layout Test fix for inspector/sources/debugger/promise-tracker.html

Source/core/inspector/InspectorDebuggerAgent.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 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.
@@ skipping 1165 matching lines @@
     m_state->setBoolean(DebuggerAgentState::promiseTrackerEnabled, true);
     promiseTracker().setEnabled(true);
 }
 
 void InspectorDebuggerAgent::disablePromiseTracker(ErrorString*)
 {
     m_state->setBoolean(DebuggerAgentState::promiseTrackerEnabled, false);
     promiseTracker().setEnabled(false);
 }
 
-void InspectorDebuggerAgent::getPromises(ErrorString*, RefPtr<Array<PromiseDetails> >& promises)
+void InspectorDebuggerAgent::getPromises(ErrorString* errorString, RefPtr<Array<PromiseDetails> >& promises)
 {
-    if (!promiseTracker().isEnabled())
+    if (!promiseTracker().isEnabled()) {
+        *errorString = "Promise tracking is disabled";
         return;
+    }
     promises = promiseTracker().promises();
 }
 
 void InspectorDebuggerAgent::scriptExecutionBlockedByCSP(const String& directiveText)
 {
     if (scriptDebugServer().pauseOnExceptionsState() != ScriptDebugServer::DontPauseOnExceptions) {
         RefPtr<JSONObject> directive = JSONObject::create();
         directive->setString("directiveText", directiveText);
         breakProgram(InspectorFrontend::Debugger::Reason::CSPViolation, directive.release());
     }
@@ skipping 305 matching lines @@
     visitor->trace(m_injectedScriptManager);
     visitor->trace(m_listener);
     visitor->trace(m_asyncCallStackTracker);
 #if ENABLE(OILPAN)
     visitor->trace(m_promiseTracker);
 #endif
     InspectorBaseAgent::trace(visitor);
 }
 
 } // namespace blink