Converts MruWindowTracker to work with common types

ash/mus/bridge/wm_shell_mus.cc

 // Copyright 2016 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/mus/bridge/wm_shell_mus.h"
 
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/wm/window_resizer.h"
 #include "ash/common/wm_activation_observer.h"
 #include "ash/mus/bridge/wm_root_window_controller_mus.h"
@@ skipping 101 matching lines @@
 bool WmShellMus::IsUserSessionBlocked() {
   NOTIMPLEMENTED();
   return false;
 }
 
 bool WmShellMus::IsScreenLocked() {
   NOTIMPLEMENTED();
   return false;
 }
 
+bool WmShellMus::CanShowWindowForUser(WmWindow* window) {
+  NOTIMPLEMENTED();
+  return true;
+}
+
 void WmShellMus::LockCursor() {
   NOTIMPLEMENTED();
 }
 
 void WmShellMus::UnlockCursor() {
   NOTIMPLEMENTED();
 }
 
 std::vector<WmWindow*> WmShellMus::GetAllRootWindows() {
   std::vector<WmWindow*> wm_windows(root_window_controllers_.size());
@@ skipping 42 matching lines @@
 void WmShellMus::AddOverviewModeObserver(WmOverviewModeObserver* observer) {
   NOTIMPLEMENTED();
 }
 
 void WmShellMus::RemoveOverviewModeObserver(WmOverviewModeObserver* observer) {
   NOTIMPLEMENTED();
 }
 
 // static
 bool WmShellMus::IsActivationParent(::mus::Window* window) {
-  if (!window)
-    return false;
-
-  const int shell_window_id = WmWindowMus::Get(window)->GetShellWindowId();
-  for (size_t i = 0; i < kNumActivatableShellWindowIds; ++i) {
-    if (shell_window_id == kActivatableShellWindowIds[i])
-      return true;
-  }
-  return false;
+  return window && IsActivatableShellWindowId(
+                       WmWindowMus::Get(window)->GetShellWindowId());
 }
 
 void WmShellMus::RemoveClientObserver() {
   if (!client_)
     return;
 
   client_->RemoveObserver(this);
   client_ = nullptr;
 }
 
 // TODO: support OnAttemptToReactivateWindow, http://crbug.com/615114.
 void WmShellMus::OnWindowTreeFocusChanged(::mus::Window* gained_focus,
                                           ::mus::Window* lost_focus) {
   WmWindowMus* gained_active = GetToplevelAncestor(gained_focus);
   WmWindowMus* lost_active = GetToplevelAncestor(gained_focus);
   if (gained_active == lost_active)
     return;
 
   FOR_EACH_OBSERVER(WmActivationObserver, activation_observers_,
                     OnWindowActivated(gained_active, lost_active));
 }
 
 void WmShellMus::OnWillDestroyClient(::mus::WindowTreeClient* client) {
   DCHECK_EQ(client, client_);
   RemoveClientObserver();
 }
 
 }  // namespace mus
 }  // namespace ash