chromeos: makes mus send keyevents to display root when nothing has focus

services/ui/ws/window_manager_display_root.cc

Index: services/ui/ws/window_manager_display_root.cc
diff --git a/services/ui/ws/window_manager_display_root.cc b/services/ui/ws/window_manager_display_root.cc
index 5a933de2c07c1e4cfd1af4b4504cfb7dd2b64e4c..cd0d7efbf1f00dddaa63face09b7a4aa6fab65b2 100644
--- a/services/ui/ws/window_manager_display_root.cc
+++ b/services/ui/ws/window_manager_display_root.cc
@@ -11,7 +11,9 @@
 #include "services/ui/ws/display.h"
 #include "services/ui/ws/display_manager.h"
 #include "services/ui/ws/server_window.h"
+#include "services/ui/ws/window_manager_state.h"
 #include "services/ui/ws/window_server.h"
+#include "services/ui/ws/window_tree.h"
 
 namespace ui {
 namespace ws {
@@ -39,6 +41,15 @@ WindowManagerDisplayRoot::WindowManagerDisplayRoot(Display* display)
 
 WindowManagerDisplayRoot::~WindowManagerDisplayRoot() {}
 
+const ServerWindow* WindowManagerDisplayRoot::GetClientVisibileRoot() const {
+  if (window_manager_state_->window_tree()
+          ->automatically_create_display_roots()) {
+    return root_.get();
+  }
+
+  return root_->children().empty() ? nullptr : root_->children()[0];
+}
+
 WindowServer* WindowManagerDisplayRoot::window_server() {
   return display_->window_server();
 }