Dispatch Mouse enter/exit window events (Linux Aura)

ui/views/widget/desktop_aura/desktop_root_window_host_x11.cc

Index: ui/views/widget/desktop_aura/desktop_root_window_host_x11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_root_window_host_x11.cc b/ui/views/widget/desktop_aura/desktop_root_window_host_x11.cc
index ca4fb27ae663333ef2d86ffa97a986a36d55a90c..6082c315678f2119bcb4dd29e85152cef8f97e9b 100644
--- a/ui/views/widget/desktop_aura/desktop_root_window_host_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_root_window_host_x11.cc
@@ -59,6 +59,18 @@ DEFINE_WINDOW_PROPERTY_KEY(
 
 namespace {
 
+class ModifiedMouseEvent : public ui::MouseEvent {
+ public:
+  ModifiedMouseEvent(const ui::MouseEvent& event, ui::EventType type)
+      : ui::MouseEvent(event,
+                       static_cast<View*>(NULL),
+                       static_cast<View*>(NULL)) {
+    SetType(type);
+  }
+
+  virtual ~ModifiedMouseEvent() {}
+};
+
 // Standard Linux mouse buttons for going back and forward.
 const int kBackMouseButton = 8;
 const int kForwardMouseButton = 9;
@@ -990,6 +1002,21 @@ bool DesktopRootWindowHostX11::Dispatch(const base::NativeEvent& event) {
   // May want to factor CheckXEventForConsistency(xev); into a common location
   // since it is called here.
   switch (xev->type) {
+    case EnterNotify: {
+      // Widget::OnMouseEvent ignores system mouse enter events since it's not
+      // used on other platforms. We'll convert this to a mouse move event to be
+      // consistent. Widget::OnMouseEvent will infer that this is actually a
+      // mouse enter event and call the correct event handler.
+      ui::MouseEvent mouse_event(xev);
+      ModifiedMouseEvent(mouse_event, ui::ET_MOUSE_MOVED);
+      DispatchMouseEvent(&mouse_event);
+      break;
+    }
+    case LeaveNotify: {
+      ui::MouseEvent mouse_event(xev);
+      DispatchMouseEvent(&mouse_event);
+      break;
+    }
     case Expose: {
       gfx::Rect damage_rect(xev->xexpose.x, xev->xexpose.y,
                             xev->xexpose.width, xev->xexpose.height);