MessagePumpForGpu - reduce potential work processing starvation

base/message_loop/message_pump_win.h

Index: base/message_loop/message_pump_win.h
diff --git a/base/message_loop/message_pump_win.h b/base/message_loop/message_pump_win.h
index ad6c119ca9e0962ae2317dddc13ae651d411e945..bf4cdaa8420b8ba3c6f2b9c81f5679a490c71138 100644
--- a/base/message_loop/message_pump_win.h
+++ b/base/message_loop/message_pump_win.h
@@ -172,6 +172,10 @@ class BASE_EXPORT MessagePumpForGpu : public MessagePumpWin {
   bool ProcessNextMessage();
 
   const HANDLE event_;
+
+  // Used to help diagnose hangs.
+  // TODO(stanisc): crbug.com/596190: Remove these once the bug is fixed.
+  TimeTicks last_set_event_timeticks_;
 };
 
 //-----------------------------------------------------------------------------