Add always-on-top property to app windows

ui/views/widget/native_widget_aura.cc

 // Copyright (c) 2012 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 "ui/views/widget/native_widget_aura.h"
 
 #include "base/bind.h"
 #include "base/strings/string_util.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/activation_client.h"
@@ skipping 516 matching lines @@
   aura::RootWindow* root = window_->GetRootWindow();
   return root &&
       aura::client::GetActivationClient(root)->GetActiveWindow() == window_;
 }
 
 void NativeWidgetAura::SetAlwaysOnTop(bool on_top) {
   if (window_)
     window_->SetProperty(aura::client::kAlwaysOnTopKey, on_top);
 }
 
+bool NativeWidgetAura::IsAlwaysOnTop() const {
+  return window_ && window_->GetProperty(aura::client::kAlwaysOnTopKey);
+}
+
 void NativeWidgetAura::Maximize() {
   if (window_)
     window_->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_MAXIMIZED);
 }
 
 void NativeWidgetAura::Minimize() {
   if (window_)
     window_->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_MINIMIZED);
 }
 
@@ skipping 597 matching lines @@
   return aura::Env::GetInstance()->is_mouse_button_down();
 }
 
 // static
 bool NativeWidgetPrivate::IsTouchDown() {
   return aura::Env::GetInstance()->is_touch_down();
 }
 
 }  // namespace internal
 }  // namespace views