MacViews: Initial skeleton for implementing NativeWidgetMac

ui/views/cocoa/bridged_content_view.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_CONTENT_VIEW_H_
+#define UI_VIEWS_COCOA_BRIDGED_CONTENT_VIEW_H_
+
+#import <Cocoa/Cocoa.h>
+
+namespace views {
+class View;
+}
+
+// The NSView that sits as the root contentView of the NSWindow, whilst it has
+// a views::RootView present. Bridges requests from Cocoa to the hosted
+// views::View.
+@interface BridgedContentView : NSView {
+ @private
+  // Weak. The hosted RootView, owned by hostedView_->GetWidget().
+  views::View* hostedView_;
+}
+
+@property(readonly, nonatomic) views::View* hostedView;
+
+// Initialize the NSView -> views::View bridge. |viewToHost| must be non-NULL.
+- (id)initWithView:(views::View*)viewToHost;
+
+// Clear the hosted view. For example, if it is about to be destroyed.
+- (void)clearView;
+
+@end
+
+#endif  // UI_VIEWS_COCOA_BRIDGED_CONTENT_VIEW_H_