[MacViews] Add NativeAppWindowViewsMac and port HideWithApp behavior from NativeAppWindowCocoa.

chrome/browser/ui/views/apps/chrome_native_app_window_views_mac.mm

+// Copyright 2015 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.
+
+#import "chrome/browser/ui/views/apps/chrome_native_app_window_views_mac.h"
+
+#include "chrome/browser/apps/app_shim/extension_app_shim_handler_mac.h"
+
+ChromeNativeAppWindowViewsMac::ChromeNativeAppWindowViewsMac()
+    : is_hidden_with_app_(false) {
+}
+
+ChromeNativeAppWindowViewsMac::~ChromeNativeAppWindowViewsMac() {
+}
+
+void ChromeNativeAppWindowViewsMac::Show() {
+  if (is_hidden_with_app_) {
+    // If there is a shim to gently request attention, return here. Otherwise
+    // show the window as usual.
+    if (apps::ExtensionAppShimHandler::ActivateAndRequestUserAttentionForWindow(
+            app_window())) {
+      return;
+    }
+  }
+
+  ChromeNativeAppWindowViews::Show();
+}
+
+void ChromeNativeAppWindowViewsMac::ShowInactive() {
+  if (is_hidden_with_app_)
+    return;
+
+  ChromeNativeAppWindowViews::ShowInactive();
+}
+
+void ChromeNativeAppWindowViewsMac::ShowWithApp() {
+  is_hidden_with_app_ = false;
+  if (!app_window()->is_hidden())
+    ShowInactive();
+}
+
+void ChromeNativeAppWindowViewsMac::HideWithApp() {
+  is_hidden_with_app_ = true;
+  ChromeNativeAppWindowViews::Hide();
+}