Ensure that the wake up timer set by the UI worker thread in the UI message pump on Windows is set …

base/message_loop/message_pump_win.h

 // Copyright (c) 2012 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.
 
 #ifndef BASE_MESSAGE_LOOP_MESSAGE_PUMP_WIN_H_
 #define BASE_MESSAGE_LOOP_MESSAGE_PUMP_WIN_H_
 
 #include <windows.h>
 
 #include <list>
@@ skipping 153 matching lines @@
   // A hidden message-only window.
   HWND message_hwnd_;
 
   // This thread is used to periodically wake up the main thread to process
   // tasks.
   scoped_ptr<base::Thread> ui_worker_thread_;
 
   // The UI worker thread waits on this timer indefinitely. When the main
   // thread has tasks ready to be processed it sets the timer.
   base::win::ScopedHandle ui_worker_thread_timer_;
+
+  // This flag controls whether the UI worker thread sets the waitable timer
+  // to ensure that tasks missed in one timer iteration get picked in the
+  // second.
+  long force_fallback_timer_for_tasks_;

[brucedawson, 2015/06/19 21:09:01]

I believe we are now allowed to use in-place initialization. If so this could be
tagged with "= 0;" instead of having to modify the constructor. I'm a huge fan.

FWIW.

[ananta, 2015/06/19 22:19:10]

Leaving this as is for consistency for now.

 };
 
 //-----------------------------------------------------------------------------
 // MessagePumpForIO extends MessagePumpWin with methods that are particular to a
 // MessageLoop instantiated with TYPE_IO. This version of MessagePump does not
 // deal with Windows mesagges, and instead has a Run loop based on Completion
 // Ports so it is better suited for IO operations.
 //
 class BASE_EXPORT MessagePumpForIO : public MessagePumpWin {
  public:
@@ skipping 179 matching lines @@
   // This list will be empty almost always. It stores IO completions that have
   // not been delivered yet because somebody was doing cleanup.
   std::list<IOItem> completed_io_;
 
   ObserverList<IOObserver> io_observers_;
 };
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_LOOP_MESSAGE_PUMP_WIN_H_