Reland: Remove aura and make a pure mojo::View version of FocusController.

mojo/services/window_manager/basic_focus_rules.h

+// Copyright 2014 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 MOJO_SERIVCES_WINDOW_MANAGER_BASIC_FOCUS_RULES_H_
+#define MOJO_SERIVCES_WINDOW_MANAGER_BASIC_FOCUS_RULES_H_
+
+#include "mojo/services/window_manager/focus_rules.h"
+
+namespace mojo {
+
+class WindowManagerApp;
+class View;
+
+// The focusing rules used inside a window manager.
+//
+// This is intended to be a user supplyable, subclassable component passed to
+// WindowManagerApp, allowing for the creation of other window managers.
+//
+// TODO(erg): This was a straight move of the minimal focus rules from when
+// WindowManagerApp directly used the wm::FocusController. This implementation
+// is very incomplete. crbug.com/431047
+class BasicFocusRules : public FocusRules {
+ public:
+  BasicFocusRules(mojo::WindowManagerApp* window_manager_app,
+                  mojo::View* window_container);
+  ~BasicFocusRules() override;
+
+ protected:
+  // Overridden from mojo::FocusRules:
+  bool IsToplevelView(mojo::View* view) const override;
+  bool CanActivateView(mojo::View* view) const override;
+  bool CanFocusView(mojo::View* view) const override;
+  mojo::View* GetToplevelView(mojo::View* view) const override;
+  mojo::View* GetActivatableView(mojo::View* view) const override;
+  mojo::View* GetFocusableView(mojo::View* view) const override;
+  mojo::View* GetNextActivatableView(mojo::View* activatable) const override;
+
+ private:
+  mojo::View* window_container_;
+  mojo::WindowManagerApp* window_manager_app_;
+
+  DISALLOW_COPY_AND_ASSIGN(BasicFocusRules);
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_SERIVCES_WINDOW_MANAGER_BASIC_FOCUS_RULES_H_