DevTools: Fix async stacks instrumentation for XHRs.

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 776 matching lines @@
         m_asyncCallStackTracker.didFireAsyncCall();
     cancelPauseOnNextStatement();
 }
 
 void InspectorDebuggerAgent::willLoadXHR(XMLHttpRequest* xhr, ThreadableLoaderClient*, const AtomicString&, const KURL&, bool async, FormData*, const HTTPHeaderMap&, bool)
 {
     if (m_asyncCallStackTracker.isEnabled() && async)
         m_asyncCallStackTracker.willLoadXHR(xhr, scriptDebugServer().currentCallFramesForAsyncStack());
 }
 
+void InspectorDebuggerAgent::didDispatchXHRLoadendEvent(XMLHttpRequest* xhr)
+{
+    if (m_asyncCallStackTracker.isEnabled())
+        m_asyncCallStackTracker.didLoadXHR(xhr);
+}
+
 void InspectorDebuggerAgent::didEnqueueMutationRecord(ExecutionContext* context, MutationObserver* observer)
 {
     if (m_asyncCallStackTracker.isEnabled() && !m_asyncCallStackTracker.hasEnqueuedMutationRecord(context, observer))
         m_asyncCallStackTracker.didEnqueueMutationRecord(context, observer, scriptDebugServer().currentCallFramesForAsyncStack());
 }
 
 void InspectorDebuggerAgent::didClearAllMutationRecords(ExecutionContext* context, MutationObserver* observer)
 {
     if (m_asyncCallStackTracker.isEnabled())
         m_asyncCallStackTracker.didClearAllMutationRecords(context, observer);
@@ skipping 577 matching lines @@
 {
     m_scripts.clear();
     m_breakpointIdToDebugServerBreakpointIds.clear();
     m_asyncCallStackTracker.clear();
     if (m_frontend)
         m_frontend->globalObjectCleared();
 }
 
 } // namespace WebCore