linux aura: Show the drag-image when available.

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 1e9bd65f83cfa3ba2d609cfc710a848da2629309..469d4560cb06353f9ea949640ce58162ccc78318 100644
--- a/ui/views/widget/widget.cc
+++ b/ui/views/widget/widget.cc
@@ -73,7 +73,8 @@ class DefaultWidgetDelegate : public WidgetDelegate {
   DefaultWidgetDelegate(Widget* widget, const Widget::InitParams& params)
       : widget_(widget),
         can_activate_(!params.child &&
-                      params.type != Widget::InitParams::TYPE_POPUP) {
+                      params.type != Widget::InitParams::TYPE_POPUP &&
+                      params.type != Widget::InitParams::TYPE_DRAG) {
   }
   virtual ~DefaultWidgetDelegate() {}
 
@@ -141,8 +142,9 @@ Widget::InitParams::InitParams(Type type)
                ViewsDelegate::views_delegate->UseTransparentWindows()) ?
               TRANSLUCENT_WINDOW : INFER_OPACITY),
       accept_events(true),
-      can_activate(type != TYPE_POPUP && type != TYPE_MENU),
-      keep_on_top(type == TYPE_MENU),
+      can_activate(type != TYPE_POPUP && type != TYPE_MENU &&
+                   type != TYPE_DRAG),
+      keep_on_top(type == TYPE_MENU || type == TYPE_DRAG),
       ownership(NATIVE_WIDGET_OWNS_WIDGET),
       mirror_origin_in_rtl(false),
       has_dropshadow(false),