Fix potential GPU crash caused by VT switching

ui/display/chromeos/display_configurator.h

Index: ui/display/chromeos/display_configurator.h
diff --git a/ui/display/chromeos/display_configurator.h b/ui/display/chromeos/display_configurator.h
index 368079aa895344ba2d1ccd6d08be6622627c2cbb..8c394e7107aac6201591f4197a1155d9c83a6a7c 100644
--- a/ui/display/chromeos/display_configurator.h
+++ b/ui/display/chromeos/display_configurator.h
@@ -381,6 +381,10 @@ class DISPLAY_EXPORT DisplayConfigurator : public NativeDisplayObserver {
   void OnDisplayControlRelinquished(const DisplayControlCallback& callback,
                                     bool success);
 
+  // Helper function that sends the actual command.

[Daniel Erat, 2016/11/14 22:44:43]

please document what "success" is, since it's unclear from the method signature,
e.g. "|success| is the result of RelinquishControl's SetDisplayPowerInternal
call."

[dnicoara, 2016/11/14 22:51:45]

Done.

+  void SendRelinquishDisplayControl(const DisplayControlCallback& callback,
+                                    bool success);
+
   StateController* state_controller_;
   SoftwareMirroringController* mirroring_controller_;
   std::unique_ptr<NativeDisplayDelegate> native_display_delegate_;