Fix event tracing for windows test flakyness....

base/event_trace_provider_win.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 #include "base/event_trace_provider_win.h"
 #include <windows.h>
 #include <cguid.h>
 
 TRACE_GUID_REGISTRATION EtwTraceProvider::obligatory_guid_registration_ = {
   &GUID_NULL,
@@ skipping 30 matching lines @@
 }
 
 ULONG EtwTraceProvider::DisableEvents() {
   // Give subclasses a chance to digest the state change.
   OnEventsDisabled();
 
   enable_level_ = 0;
   enable_flags_ = 0;
   session_handle_ = NULL;
 
+  PostEventsDisabled();
+
   return ERROR_SUCCESS;
 }
 
 ULONG EtwTraceProvider::Callback(WMIDPREQUESTCODE request, void* buffer) {
   switch (request) {
     case WMI_ENABLE_EVENTS:
       return EnableEvents(buffer);
     case WMI_DISABLE_EVENTS:
       return DisableEvents();
     default:
@@ skipping 56 matching lines @@
 
   return ::TraceEvent(session_handle_, &event.header);
 }
 
 ULONG EtwTraceProvider::Log(EVENT_TRACE_HEADER* event) {
   if (enable_level_ < event->Class.Level)
     return ERROR_SUCCESS;
 
   return ::TraceEvent(session_handle_, event);
 }