Fix Z-order for a bubble when it appears for inactive window.

ui/views/widget/desktop_aura/desktop_native_widget_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/widget/desktop_aura/desktop_native_widget_aura.h"
 
 #include "base/bind.h"
 #include "base/trace_event/trace_event.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/cursor_client.h"
@@ skipping 702 matching lines @@
     gfx::ScaleToEnclosingRect(bounds, scale, scale);
   desktop_window_tree_host_->AsWindowTreeHost()->SetBounds(bounds_in_pixels);
 }
 
 void DesktopNativeWidgetAura::SetSize(const gfx::Size& size) {
   if (content_window_)
     desktop_window_tree_host_->SetSize(size);
 }
 
 void DesktopNativeWidgetAura::StackAbove(gfx::NativeView native_view) {
+  if (content_window_)
+    desktop_window_tree_host_->StackAbove(native_view);
 }
 
 void DesktopNativeWidgetAura::StackAtTop() {
   if (content_window_)
     desktop_window_tree_host_->StackAtTop();
 }
 
 void DesktopNativeWidgetAura::StackBelow(gfx::NativeView native_view) {
 }
 
@@ skipping 512 matching lines @@
   if (cursor_reference_count_ == 0) {
     // We are the last DesktopNativeWidgetAura instance, and we are responsible
     // for cleaning up |cursor_manager_|.
     delete cursor_manager_;
     native_cursor_manager_ = NULL;
     cursor_manager_ = NULL;
   }
 }
 
 }  // namespace views