Verify if GPU message pump is signaled when it hangs in WaitForWork

base/message_loop/message_pump_win.cc

 // 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.
 
 #include "base/message_loop/message_pump_win.h"
 
 #include <math.h>
 #include <stdint.h>
 
 #include <limits>
@@ skipping 447 matching lines @@
 }
 
 void MessagePumpForGpu::ScheduleDelayedWork(
     const TimeTicks& delayed_work_time) {
   // We know that we can't be blocked right now since this method can only be
   // called on the same thread as Run, so we only need to update our record of
   // how long to sleep when we do sleep.
   delayed_work_time_ = delayed_work_time;
 }
 
+bool MessagePumpForGpu::WasSignaled() {
+  // If |event_| was set this would reset it back to unset state.
+  return WaitForSingleObject(event_, 0) == WAIT_OBJECT_0;
+}
+
 //-----------------------------------------------------------------------------
 // MessagePumpForGpu private:
 
 void MessagePumpForGpu::DoRunLoop() {
   while (!state_->should_quit) {
     // Indicate that the loop is handling the work.
     // If there is a race condition between switching to WORKING state here and
     // the producer thread setting the HAVE_WORK state after exiting the wait,
     // the event might remain in the signalled state. That might be less than
     // optimal but wouldn't result in failing to handle the work.
@@ skipping 254 matching lines @@
     if (!filter || it->handler == filter) {
       *item = *it;
       completed_io_.erase(it);
       return true;
     }
   }
   return false;
 }
 
 }  // namespace base