Attempt to re-land FocusManager removal from Aura.

ui/aura/test/test_focus_client.h

+// Copyright 2013 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.
+
+#ifndef UI_AURA_TEST_TEST_FOCUS_CLIENT_H_
+#define UI_AURA_TEST_TEST_FOCUS_CLIENT_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/scoped_observer.h"
+#include "ui/aura/client/focus_client.h"
+#include "ui/aura/window_observer.h"
+
+namespace aura {
+namespace test {
+
+class TestFocusClient : public client::FocusClient,
+                        public WindowObserver {
+ public:
+  TestFocusClient();
+  virtual ~TestFocusClient();
+
+ private:
+  // Overridden from client::FocusClient:
+  virtual void AddObserver(client::FocusChangeObserver* observer) OVERRIDE;
+  virtual void RemoveObserver(client::FocusChangeObserver* observer) OVERRIDE;
+  virtual void FocusWindow(Window* window) OVERRIDE;
+  virtual void ResetFocusWithinActiveWindow(Window* window) OVERRIDE;
+  virtual Window* GetFocusedWindow() OVERRIDE;
+
+  // Overridden from WindowObserver:
+  virtual void OnWindowDestroying(Window* window) OVERRIDE;
+
+  Window* focused_window_;
+  ScopedObserver<Window, WindowObserver> observer_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestFocusClient);
+};
+
+}  // namespace test
+}  // namespace aura
+
+#endif  // UI_AURA_TEST_TEST_FOCUS_CLIENT_H_