ccameron's https://codereview.chromium.org/23191007 with some changes to work

base/message_loop/message_pump_x11.cc

Index: base/message_loop/message_pump_x11.cc
diff --git a/base/message_loop/message_pump_x11.cc b/base/message_loop/message_pump_x11.cc
index 7e780b2aba629df75cce34f4cbd477dea24db4cf..dd8b965e69568b3710211e045ec834e4db86e70f 100644
--- a/base/message_loop/message_pump_x11.cc
+++ b/base/message_loop/message_pump_x11.cc
@@ -158,7 +158,13 @@ bool MessagePumpX11::HasXInput2() {
   return InitializeXInput2();
 }
 
-#if !defined(TOOLKIT_GTK)
+#if defined(TOOLKIT_GTK)
+// static
+MessagePumpX11* MessagePumpX11::Current() {
+  MessageLoop* loop = MessageLoop::current();
+  return static_cast<MessagePumpX11*>(loop->pump_gpu());
+}
+#else
 // static
 MessagePumpX11* MessagePumpX11::Current() {
   MessageLoopForUI* loop = MessageLoopForUI::current();