Whitelist virtual keyboard container to process events at login screen

ash/wm/event_client_impl.cc

Index: ash/wm/event_client_impl.cc
diff --git a/ash/wm/event_client_impl.cc b/ash/wm/event_client_impl.cc
index fcdc1b425d382c948e31b0135fff8e61d105c5ee..6a7a02a945b0f57a1bd00bcc5c6d19535e153dce 100644
--- a/ash/wm/event_client_impl.cc
+++ b/ash/wm/event_client_impl.cc
@@ -8,6 +8,7 @@
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ui/aura/window.h"
+#include "ui/keyboard/keyboard_util.h"
 
 namespace ash {
 namespace internal {
@@ -33,12 +34,20 @@ bool EventClientImpl::CanProcessEventsWithinSubtree(
     const aura::Window* lock_screen_related_containers = Shell::GetContainer(
         root_window,
         kShellWindowId_LockScreenRelatedContainersContainer);
-    return (window->Contains(lock_screen_containers) &&
+    bool can_process_events = (window->Contains(lock_screen_containers) &&
         window->Contains(lock_background_containers) &&
         window->Contains(lock_screen_related_containers)) ||
         lock_screen_containers->Contains(window) ||
         lock_background_containers->Contains(window) ||
         lock_screen_related_containers->Contains(window);
+    if (keyboard::IsKeyboardEnabled()) {
+      const aura::Window* virtual_keyboard_container = Shell::GetContainer(
+          root_window,
+          kShellWindowId_VirtualKeyboardContainer);
+      can_process_events |= (window->Contains(virtual_keyboard_container) ||
+                             virtual_keyboard_container->Contains(window));
+    }
+    return can_process_events;
   }
   return true;
 }