DevTools: Support XHR async call stacks in the debugger.

Source/core/inspector/InspectorDebuggerAgent.cpp

Index: Source/core/inspector/InspectorDebuggerAgent.cpp
diff --git a/Source/core/inspector/InspectorDebuggerAgent.cpp b/Source/core/inspector/InspectorDebuggerAgent.cpp
index 7a6370391d0ea9c29bdd61470819e94f9160f707..2a1de30353bb193d84a25be5d7cc3d6ef4f7e0f2 100644
--- a/Source/core/inspector/InspectorDebuggerAgent.cpp
+++ b/Source/core/inspector/InspectorDebuggerAgent.cpp
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
- * Copyright (C) 2010-2011 Google 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
@@ -745,6 +745,12 @@ void InspectorDebuggerAgent::didHandleEvent()
     cancelPauseOnNextStatement();
 }
 
+void InspectorDebuggerAgent::willLoadXHR(XMLHttpRequest* xhr, ThreadableLoaderClient*, const AtomicString&, const KURL&, bool async, PassRefPtr<FormData>, const HTTPHeaderMap&, bool)
+{
+    if (m_asyncCallStackTracker.isEnabled() && async)
+        m_asyncCallStackTracker.willLoadXHR(xhr, scriptDebugServer().currentCallFrames());
+}
+
 void InspectorDebuggerAgent::pause(ErrorString*)
 {
     if (m_javaScriptPauseScheduled)