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

ui/wm/core/wm_state.h

Index: ui/wm/core/wm_state.h
diff --git a/ui/wm/core/wm_state.h b/ui/wm/core/wm_state.h
index b846f709805558ed7f46554efd29ca95efd4ad40..dff17a69ec3f4eeca341500bbdda35996300c679 100644
--- a/ui/wm/core/wm_state.h
+++ b/ui/wm/core/wm_state.h
@@ -8,6 +8,10 @@
 #include "base/memory/scoped_ptr.h"
 #include "ui/wm/core/wm_core_export.h"
 
+namespace ui {
+class PlatformEventSource;
+}
+
 namespace wm {
 
 class TransientWindowController;
@@ -23,6 +27,7 @@ class WM_CORE_EXPORT WMState {
  private:
   scoped_ptr<TransientWindowStackingClient> window_stacking_client_;
   scoped_ptr<TransientWindowController> transient_window_client_;
+  scoped_ptr<ui::PlatformEventSource> event_source_;
 
   DISALLOW_COPY_AND_ASSIGN(WMState);
 };