MacViews: Initial skeleton for implementing NativeWidgetMac

ui/views/cocoa/bridged_native_widget.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.
+
+#ifndef UI_VIEWS_COCOA_BRIDGED_NATIVE_WIDGET_H_
+#define UI_VIEWS_COCOA_BRIDGED_NATIVE_WIDGET_H_
+
+#import <Cocoa/Cocoa.h>
+
+#import "base/mac/scoped_nsobject.h"
+#include "ui/views/views_export.h"
+
+@class BridgedContentView;
+
+namespace views {
+
+class View;
+
+// A bridge to an NSWindow managed by an instance of NativeWidgetMac or
+// DesktopNativeWidgetMac. Serves as a helper class to bridge requests from the
+// NativeWidgetMac to the Cocoa window. Behaves a bit like an aura::Window.
+class VIEWS_EXPORT BridgedNativeWidget {
+ public:
+  BridgedNativeWidget();
+  ~BridgedNativeWidget();
+
+  // Initialize the bridge, "retains" ownership of |window|.
+  void Init(base::scoped_nsobject<NSWindow> window);
+
+  // Set or clears the views::View bridged by the content view. This does NOT
+  // take ownership of |view|.
+  void SetRootView(views::View* view);
+
+  BridgedContentView* ns_view() { return bridged_view_; }
+  NSWindow* ns_window() { return window_; }
+
+ private:
+  base::scoped_nsobject<NSWindow> window_;
+  base::scoped_nsobject<BridgedContentView> bridged_view_;
+
+  DISALLOW_COPY_AND_ASSIGN(BridgedNativeWidget);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_COCOA_BRIDGED_NATIVE_WIDGET_H_