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

content/gpu/gpu_watchdog_thread.cc

Index: content/gpu/gpu_watchdog_thread.cc
diff --git a/content/gpu/gpu_watchdog_thread.cc b/content/gpu/gpu_watchdog_thread.cc
index 68ba816ed8c831850ecc29ca1a7a1b44ba6b327b..3538e7fdc30712f46a471f0ac74fdd40dfb44af3 100644
--- a/content/gpu/gpu_watchdog_thread.cc
+++ b/content/gpu/gpu_watchdog_thread.cc
@@ -346,6 +346,10 @@ void GpuWatchdogThread::DeliberatelyTerminateToRecoverFromHang() {
 
   bool using_high_res_timer = base::Time::IsHighResolutionTimerInUse();
   base::debug::Alias(&using_high_res_timer);
+
+  bool message_pump_is_signalled =
+      watched_message_loop_->MessagePumpWasSignalled();
+  base::debug::Alias(&message_pump_is_signalled);
 #endif
 
   base::Time current_time = base::Time::Now();