Make browser windows override_redirect when dragging tabs.

ui/views/widget/widget.cc

Index: ui/views/widget/widget.cc
diff --git a/ui/views/widget/widget.cc b/ui/views/widget/widget.cc
index 280969a84e5e7d0067d1f10378dec9d6d15061fb..fdccce28df112e6a686754aa93c6f333b7e610d0 100644
--- a/ui/views/widget/widget.cc
+++ b/ui/views/widget/widget.cc
@@ -306,6 +306,7 @@ gfx::Size Widget::GetLocalizedContentsSize(int col_resource_id,
 // static
 bool Widget::RequiresNonClientView(InitParams::Type type) {
   return type == InitParams::TYPE_WINDOW ||
+         type == InitParams::TYPE_DRAG ||
          type == InitParams::TYPE_PANEL ||
          type == InitParams::TYPE_BUBBLE;
 }
@@ -319,6 +320,7 @@ void Widget::Init(const InitParams& in_params) {
 
   if (params.opacity == views::Widget::InitParams::INFER_OPACITY &&
       params.type != views::Widget::InitParams::TYPE_WINDOW &&
+      params.type != views::Widget::InitParams::TYPE_DRAG &&
       params.type != views::Widget::InitParams::TYPE_PANEL)
     params.opacity = views::Widget::InitParams::OPAQUE_WINDOW;