When we switch tabs in chrome, the tab being switched away from gets hidden/shown/hidden.

ui/views/controls/native/native_view_host_aura.cc

 // 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.
 
 #include "ui/views/controls/native/native_view_host_aura.h"
 
 #include "base/logging.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/focus_client.h"
 #include "ui/aura/window.h"
@@ skipping 79 matching lines @@
 void NativeViewHostAura::AttachNativeView() {
   clipping_window_delegate_->set_native_view(host_->native_view());
   host_->native_view()->AddObserver(this);
   host_->native_view()->SetProperty(views::kHostViewKey,
       static_cast<View*>(host_));
   AddClippingWindow();
 }
 
 void NativeViewHostAura::NativeViewDetaching(bool destroyed) {
   clipping_window_delegate_->set_native_view(NULL);
+  if (!destroyed)
+    host_->native_view()->Hide();

[sky, 2014/09/11 16:03:19]

Why do we need to hide at all here?

[ananta, 2014/09/11 16:21:07]

If we don't hide it the WCVA code which listens for parent changed, makes the
window visible if the parent is visible.

[sky, 2014/09/11 16:43:36]

Here's what the code for windows did eons ago:

void NativeViewHostWin::NativeViewDetaching(bool destroyed) {
  if (!destroyed) {
    if (installed_clip_)
      UninstallClip();
    Widget::ReparentNativeView(host_->native_view(), ui::GetHiddenWindow());
  }
  installed_clip_ = false;
}

It didn't muck with visibility at all.

+
   RemoveClippingWindow();
+
   if (!destroyed) {
     host_->native_view()->RemoveObserver(this);
     host_->native_view()->ClearProperty(views::kHostViewKey);
     host_->native_view()->ClearProperty(aura::client::kHostWindowKey);
-    host_->native_view()->Hide();
     if (host_->native_view()->parent())
       Widget::ReparentNativeView(host_->native_view(), NULL);
   }
 }
 
 void NativeViewHostAura::AddedToWidget() {
   if (!host_->native_view())
     return;
 
   AddClippingWindow();
@@ skipping 110 matching lines @@
     } else {
       clipping_window_.RemoveChild(host_->native_view());
     }
     host_->native_view()->SetBounds(clipping_window_.bounds());
   }
   if (clipping_window_.parent())
     clipping_window_.parent()->RemoveChild(&clipping_window_);
 }
 
 }  // namespace views