Make browser windows override_redirect when dragging tabs.

chrome/browser/ui/views/chrome_views_delegate_aura.cc

 // Copyright 2013 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 "chrome/browser/ui/views/chrome_views_delegate.h"
 
 #include "chrome/browser/ui/ash/ash_util.h"
 
 views::Widget::InitParams::WindowOpacity
 ChromeViewsDelegate::GetOpacityForInitParams(
     const views::Widget::InitParams& params) {
   gfx::NativeView native_view = params.parent ? params.parent : params.context;
   if (native_view && chrome::IsNativeViewInAsh(native_view))
     return views::Widget::InitParams::TRANSLUCENT_WINDOW;
 
   // We want translucent windows when either we are in ASH or we are
   // a top level window which is not of type TYPE_WINDOW.
-  if (!params.child && params.type != views::Widget::InitParams::TYPE_WINDOW)
+  if (!params.child &&
+      (params.type != views::Widget::InitParams::TYPE_WINDOW ||
+       params.type != views::Widget::InitParams::TYPE_DRAG_BROWSER))
     return views::Widget::InitParams::TRANSLUCENT_WINDOW;
 
   return views::Widget::InitParams::OPAQUE_WINDOW;
 }