MacViews: Implement non-client frame view

ui/views/widget/native_widget_mac.mm

 // 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 "ui/views/widget/native_widget_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 111 matching lines @@
 
 NonClientFrameView* NativeWidgetMac::CreateNonClientFrameView() {
   return new NativeFrameView(GetWidget());
 }
 
 bool NativeWidgetMac::ShouldUseNativeFrame() const {
   return true;
 }
 
 bool NativeWidgetMac::ShouldWindowContentsBeTransparent() const {
-  // On Windows, this returns false when DWM is unavailable (e.g. XP, RDP or
-  // classic mode). OSX always has a compositing window manager.
-  return true;
+  // On Windows, this returns true when Aero is enabled which draws the titlebar
+  // with translucency.
+  return false;
 }
 
 void NativeWidgetMac::FrameTypeChanged() {
   NOTIMPLEMENTED();
 }
 
 Widget* NativeWidgetMac::GetWidget() {
   return delegate_->AsWidget();
 }
 
@@ skipping 473 matching lines @@
 }
 
 // static
 gfx::FontList NativeWidgetPrivate::GetWindowTitleFontList() {
   NOTIMPLEMENTED();
   return gfx::FontList();
 }
 
 }  // namespace internal
 }  // namespace views