Changes DesktopNativeWidgetAura to not call InitHost or window->Show()

ui/views/widget/desktop_aura/desktop_window_tree_host.h

 // Copyright (c) 2012 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_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_H_
 
 #include <memory>
 
 #include "ui/aura/window_event_dispatcher.h"
@@ skipping 29 matching lines @@
 
 class VIEWS_EXPORT DesktopWindowTreeHost {
  public:
   virtual ~DesktopWindowTreeHost() {}
 
   static DesktopWindowTreeHost* Create(
       internal::NativeWidgetDelegate* native_widget_delegate,
       DesktopNativeWidgetAura* desktop_native_widget_aura);
 
   // Sets up resources needed before the WindowEventDispatcher has been created.
+  // It is expected this calls InitHost() on the WindowTreeHost.
   virtual void Init(aura::Window* content_window,
                     const Widget::InitParams& params) = 0;
 
   // Invoked once the DesktopNativeWidgetAura has been created.
   virtual void OnNativeWidgetCreated(const Widget::InitParams& params) = 0;
 
   // Called from DesktopNativeWidgetAura::OnWidgetInitDone().
   virtual void OnWidgetInitDone() = 0;
 
   // Creates and returns the Tooltip implementation to use. Return value is
@@ skipping 101 matching lines @@
 
   // A return value of true indicates DesktopNativeCursorManager should be
   // used, a return value of false indicates the DesktopWindowTreeHost manages
   // cursors itself.
   virtual bool ShouldUseDesktopNativeCursorManager() const = 0;
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_H_