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

base/message_loop/message_loop.h

Index: base/message_loop/message_loop.h
diff --git a/base/message_loop/message_loop.h b/base/message_loop/message_loop.h
index 11d87122c32e6da0624c670e48ed77fa5b6c8d6f..1230f4196d0799c5ed59fe4a51e320de2eb6bf88 100644
--- a/base/message_loop/message_loop.h
+++ b/base/message_loop/message_loop.h
@@ -390,6 +390,15 @@ class BASE_EXPORT MessageLoop : public MessagePump::Delegate {
   // Runs the specified PendingTask.
   void RunTask(const PendingTask& pending_task);
 
+#if defined(OS_WIN)
+  // TODO (stanisc): crbug.com/596190: Remove this after the signaling issue

[brucedawson, 2016/06/17 18:24:44]

Is this comment about removal still needed? That is, should this still be a TODO
comment? Bug number is still good. Applies to other comments also.

+  // has been investigated.
+  // This should be used for diagnostic only. If message pump wake-up mechanism
+  // is based on auto-reset event this call would reset the event to unset
+  // state.
+  bool MessagePumpWasSignaled();
+#endif
+
   //----------------------------------------------------------------------------
  protected:
   std::unique_ptr<MessagePump> pump_;