Fix X11DesktopHandler::ActivateWindow on Unity for known user gestures

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
index 69c5b2f44a8f567170a4288df8c584b1ddf81b19..821a3f8cf1be9753324a3cb16cd16c80a3107671 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
@@ -523,7 +523,16 @@ void DesktopWindowTreeHostX11::Activate() {
   if (!window_mapped_)
     return;
 
-  X11DesktopHandler::get()->ActivateWindow(xwindow_);
+  X11DesktopHandler::get()->ActivateWindow(xwindow_,
+                                           false /* for_user_gesture */);
+}
+
+void DesktopWindowTreeHostX11::ActivateForUserGesture() {
+  if (!window_mapped_)
+    return;
+
+  X11DesktopHandler::get()->ActivateWindow(xwindow_,
+                                           true /* for_user_gesture */);
 }
 
 void DesktopWindowTreeHostX11::Deactivate() {