x11: Move X event handling out of the message-pump.

ui/wm/test/wm_test_helper.h

Index: ui/wm/test/wm_test_helper.h
diff --git a/ui/wm/test/wm_test_helper.h b/ui/wm/test/wm_test_helper.h
index e01486b93318ec3c4e8e45ed36c288aa6eafa2a5..1bde9f33f7a3388c93f344a581ab50a9309cb34f 100644
--- a/ui/wm/test/wm_test_helper.h
+++ b/ui/wm/test/wm_test_helper.h
@@ -25,13 +25,15 @@ class Rect;
 class Size;
 }
 
-namespace wm {
-class CompoundEventFilter;
-class InputMethodEventFilter;
+namespace ui {
+class PlatformEventSource;
 }
 
 namespace wm {
 
+class CompoundEventFilter;
+class InputMethodEventFilter;
+
 // Creates a minimal environment for running the shell. We can't pull in all of
 // ash here, but we can create attach several of the same things we'd find in
 // the ash parts of the code.
@@ -57,6 +59,7 @@ class WMTestHelper : public aura::client::WindowTreeClient {
   scoped_ptr<wm::InputMethodEventFilter> input_method_filter_;
   scoped_ptr<aura::client::DefaultActivationClient> activation_client_;
   scoped_ptr<aura::client::FocusClient> focus_client_;
+  scoped_ptr<ui::PlatformEventSource> event_source_;
 
   DISALLOW_COPY_AND_ASSIGN(WMTestHelper);
 };