DevTools: Support async call stacks for FileSystem API (part 1).

Source/core/inspector/InspectorDebuggerAgent.h

Index: Source/core/inspector/InspectorDebuggerAgent.h
diff --git a/Source/core/inspector/InspectorDebuggerAgent.h b/Source/core/inspector/InspectorDebuggerAgent.h
index d3cf7d1f714ba97478b674f376d1679f9660a233..fb5278d93740a5791a5ae70d18b872138557cbff 100644
--- a/Source/core/inspector/InspectorDebuggerAgent.h
+++ b/Source/core/inspector/InspectorDebuggerAgent.h
@@ -47,6 +47,7 @@
 
 namespace WebCore {
 
+class AsyncFileSystemCallbacks;
 class Document;
 class Event;
 class EventListener;
@@ -164,6 +165,10 @@ public:
     void didKillAllExecutionContextTasks(ExecutionContext*);
     void willPerformExecutionContextTask(ExecutionContext*, ExecutionContextTask*);
     void didPerformExecutionContextTask();
+    void didEnqueueAsyncFileSystemCallback(ExecutionContext*, AsyncFileSystemCallbacks*);
+    void didRemoveAsyncFileSystemCallback(ExecutionContext*, AsyncFileSystemCallbacks*);
+    void willHandleAsyncFileSystemCallback(ExecutionContext*, AsyncFileSystemCallbacks*, bool willReschedule, bool hasMore);
+    void didHandleAsyncFileSystemCallback(ExecutionContext*, AsyncFileSystemCallbacks*, bool didReschedule);
     bool canBreakProgram();
     void breakProgram(InspectorFrontend::Debugger::Reason::Enum breakReason, PassRefPtr<JSONObject> data);
     void scriptExecutionBlockedByCSP(const String& directiveText);