chromeos: fix focus for mushrome

ash/mus/window_manager_common_unittests.cc

Index: ash/mus/window_manager_common_unittests.cc
diff --git a/ash/mus/window_manager_common_unittests.cc b/ash/mus/window_manager_common_unittests.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ccec34cd8421047e67ee62b8b1186b2a27c8eaf2
--- /dev/null
+++ b/ash/mus/window_manager_common_unittests.cc
@@ -0,0 +1,49 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ash/public/cpp/config.h"
+#include "ash/shell.h"
+#include "ash/test/ash_test_base.h"
+#include "ash/test/ash_test_helper.h"
+#include "ui/aura/test/mus/test_window_manager_client.h"
+#include "ui/aura/test/mus/test_window_tree.h"
+#include "ui/aura/test/mus/test_window_tree_client_setup.h"
+#include "ui/aura/window.h"
+
+// The tests in this file are in all configs of ash, where as those in
+// window_manager_unittest.cc is only run in Config::MASH.
+
+namespace ash {
+namespace mus {
+
+using WindowManagerCommonTest = test::AshTestBase;
+
+TEST_F(WindowManagerCommonTest, Focus) {
+  if (Shell::GetAshConfig() == Config::CLASSIC)
+    return;
+
+  // Ensure that activation parents have been added, an ancestor of |window|
+  // must support activation for the focus attempt below to succeed.
+  aura::TestWindowManagerClient* test_window_manager_client =
+      ash_test_helper()
+          ->window_tree_client_setup()
+          ->test_window_manager_client();
+  EXPECT_LT(0u,
+            test_window_manager_client->GetChangeCountForType(
+                aura::WindowManagerClientChangeType::ADD_ACTIVATION_PARENT));
+
+  // Ensure a call to Window::Focus() makes it way to the WindowTree.
+  std::unique_ptr<aura::Window> window = CreateTestWindow();
+  aura::TestWindowTree* test_window_tree =
+      ash_test_helper()->window_tree_client_setup()->window_tree();
+  const size_t initial_focus_count = test_window_tree->GetChangeCountForType(
+      aura::WindowTreeChangeType::FOCUS);
+  window->Focus();
+  EXPECT_TRUE(window->HasFocus());
+  EXPECT_EQ(initial_focus_count + 1, test_window_tree->GetChangeCountForType(
+                                         aura::WindowTreeChangeType::FOCUS));
+}
+
+}  // namespace mus
+}  // namespace ash