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

base/message_loop/message_pump_win.cc

Index: base/message_loop/message_pump_win.cc
diff --git a/base/message_loop/message_pump_win.cc b/base/message_loop/message_pump_win.cc
index 5e0c08a2506b8bb2c2f8a024c16bb49c788f3766..a2c98374ddd643bc4ec2a9c0f178c67652f09b19 100644
--- a/base/message_loop/message_pump_win.cc
+++ b/base/message_loop/message_pump_win.cc
@@ -465,6 +465,11 @@ void MessagePumpForGpu::ScheduleDelayedWork(
   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: