[MacViews] Frameless app windows: make content view cover title bar.

ui/views/widget/native_widget_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.
 
 #ifndef UI_VIEWS_WIDGET_NATIVE_WIDGET_MAC_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_MAC_H_
 
 #include "ui/gfx/native_widget_types.h"
 #include "ui/views/widget/native_widget_private.h"
 
@@ skipping 100 matching lines @@
   void SetVisibilityAnimationDuration(const base::TimeDelta& duration) override;
   void SetVisibilityAnimationTransition(
       Widget::VisibilityTransition transition) override;
   ui::NativeTheme* GetNativeTheme() const override;
   void OnRootViewLayout() override;
   bool IsTranslucentWindowOpacitySupported() const override;
   void OnSizeConstraintsChanged() override;
   void RepostNativeEvent(gfx::NativeEvent native_event) override;
 
  protected:
+  // Creates the NSWindow that will be passed to the BridgedNativeWidget.
+  // Called by InitNativeWidget. The return value will be autoreleased.
+  virtual gfx::NativeWindow CreateNSWindow(const Widget::InitParams& params);
+
   internal::NativeWidgetDelegate* delegate() { return delegate_; }
 
  private:
   friend class test::MockNativeWidgetMac;
 
   internal::NativeWidgetDelegate* delegate_;
   scoped_ptr<BridgedNativeWidget> bridge_;
 
   Widget::InitParams::Ownership ownership_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetMac);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_MAC_H_