DevTools: Async call stacks for FileSystem API part 2.

Source/core/inspector/InspectorInstrumentation.idl

 /*
 * 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
@@ skipping 444 matching lines @@
     [DOM, Inline=FastReturn]
     void pseudoElementDestroyed([Keep] PseudoElement*);
 
     [DOMDebugger, Inline=FastReturn]
     void willExecuteCustomElementCallback([Keep] Element*);
 
     [Debugger, Inline=FastReturn]
     int traceAsyncOperationStarting([Keep] ExecutionContext*, const String& operationName);
 
     [Debugger, Inline=FastReturn]
+    int traceAsyncOperationStarting([Keep] ExecutionContext*, const String& operationName, int prevOperationId);
+
+    [Debugger, Inline=FastReturn]
     void traceAsyncOperationCompleted([Keep] ExecutionContext*, int operationId);
 
     [Debugger, Inline=FastReturn]
     InspectorInstrumentationCookie traceAsyncOperationCompletedCallbackStarting([Keep] ExecutionContext*, int operationId);
 
     [Debugger, Inline=FastReturn]
     InspectorInstrumentationCookie traceAsyncCallbackStarting([Keep] ExecutionContext*, int operationId);
 
     [Debugger, Inline=FastReturn]
     void traceAsyncCallbackCompleted(const InspectorInstrumentationCookie&);
@@ skipping 53 matching lines @@
 interface InspectorCanvasInstrumentation {
 
 #include "bindings/core/v8/ScriptValue.h"
 
     [Canvas]
     ScriptValue wrapCanvas2DRenderingContextForInstrumentation(Document*, const ScriptValue&);
 
     [Canvas]
     ScriptValue wrapWebGLRenderingContextForInstrumentation(Document*, const ScriptValue&);
 }