Enable immersive fullscreen on Windows Ash.

ui/wm/core/compound_event_filter.cc

Index: ui/wm/core/compound_event_filter.cc
diff --git a/ui/wm/core/compound_event_filter.cc b/ui/wm/core/compound_event_filter.cc
index f7ab7d7223b619aacff793960fd8f0c9d02bc647..620babd54a62b669faa1d4d85011f62ab2d6af18 100644
--- a/ui/wm/core/compound_event_filter.cc
+++ b/ui/wm/core/compound_event_filter.cc
@@ -291,6 +291,17 @@ void CompoundEventFilter::OnGestureEvent(ui::GestureEvent* event) {
     while (!event->stopped_propagation() && (handler = it.GetNext()) != NULL)
       handler->OnGestureEvent(event);
   }
+
+#if defined(OS_WIN)
+  // A Win8 edge swipe event is a special event that does not have location
+  // information associated with it, and is not preceeded by an ET_TOUCH_PRESSED
+  // event.  So we treat it specially here.
+  if (!event->handled() && event->type() == ui::ET_GESTURE_WIN8_EDGE_SWIPE &&
+      !aura::Env::GetInstance()->IsMouseButtonDown()) {
+    SetMouseEventsEnableStateOnEvent(
+        static_cast<aura::Window*>(event->target()), event, false);
+  }
+#endif
 }
 
 }  // namespace wm