Set focusibility correctly when initializing a window in mus+ash.

services/ui/ws/window_manager_client_unittest.cc

Index: services/ui/ws/window_manager_client_unittest.cc
diff --git a/services/ui/ws/window_manager_client_unittest.cc b/services/ui/ws/window_manager_client_unittest.cc
index 4a5896f9e495882e8bb2c3cc35be77a288da5b1b..6362f4cc782fe8491f1766199e99935b1e6e0335 100644
--- a/services/ui/ws/window_manager_client_unittest.cc
+++ b/services/ui/ws/window_manager_client_unittest.cc
@@ -54,6 +54,7 @@ class TestWindowManagerDelegate : public aura::WindowManagerDelegate {
       std::unique_ptr<std::vector<uint8_t>>* new_data) override {
     return false;
   }
+  void OnWmSetCanFocus(aura::Window* window, bool can_focus) override {}
   aura::Window* OnWmCreateTopLevelWindow(
       ui::mojom::WindowType window_type,
       std::map<std::string, std::vector<uint8_t>>* properties) override {