mash: Convert FocusCycler to wm common types and move to //ash/common

ash/mus/bridge/wm_window_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_window_mus.h"
 
 #include "ash/common/wm/container_finder.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm_layout_manager.h"
 #include "ash/common/wm_window_observer.h"
@@ skipping 553 matching lines @@
 }
 
 void WmWindowMus::Hide() {
   window_->SetVisible(false);
 }
 
 void WmWindowMus::Show() {
   window_->SetVisible(true);
 }
 
+views::Widget* WmWindowMus::GetWidget() {
+  // Don't return the window frame widget for an embedded window.
+  if (widget_creation_type_ == WidgetCreationType::FOR_CLIENT)
+    return nullptr;
+
+  return widget_;
+}
+
 void WmWindowMus::CloseWidget() {
   DCHECK(widget_);
   // Allow the client to service the close request for remote widgets.
   if (widget_creation_type_ == WidgetCreationType::FOR_CLIENT)
     window_->RequestClose();
   else
     widget_->Close();
 }
 
 bool WmWindowMus::IsFocused() const {
@@ skipping 159 matching lines @@
 void WmWindowMus::OnWindowDestroying(::mus::Window* window) {
   FOR_EACH_OBSERVER(WmWindowObserver, observers_, OnWindowDestroying(this));
 }
 
 void WmWindowMus::OnWindowDestroyed(::mus::Window* window) {
   FOR_EACH_OBSERVER(WmWindowObserver, observers_, OnWindowDestroyed(this));
 }
 
 }  // namespace mus
 }  // namespace ash