AppShell support for Mac.

extensions/shell/browser/shell_desktop_controller_mac.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.
+
+#include "extensions/shell/browser/desktop_controller.h"
+
+#include "base/memory/scoped_ptr.h"
+
+namespace extensions {
+
+class AppWindow;
+class AppWindowClient;
+
+// A simple implementation of the app_shell DesktopController for Mac Cocoa.
+// Only currently supports one app window (unlike Aura).
+class ShellDesktopControllerMac : public DesktopController {
+ public:
+  ShellDesktopControllerMac();
+  ~ShellDesktopControllerMac() override;
+
+  // DesktopController:
+  gfx::Size GetWindowSize() override;
+  AppWindow* CreateAppWindow(content::BrowserContext* context,
+                             const Extension* extension) override;
+  void AddAppWindow(gfx::NativeWindow window) override;
+  void RemoveAppWindow(AppWindow* window) override;
+  void CloseAppWindows() override;
+
+ private:
+  scoped_ptr<AppWindowClient> app_window_client_;
+
+  // The desktop only supports a single app window.
+  // TODO(yoz): Support multiple app windows, as we do in Aura.
+  AppWindow* app_window_;  // NativeAppWindow::Close() deletes this.
+
+  DISALLOW_COPY_AND_ASSIGN(ShellDesktopControllerMac);
+};
+
+}  // namespace extensions