x11: Use opaque window for dnd without composite.

ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.cc

Index: ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.cc b/ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.cc
index a1118cfeb31a6487a4db94f0ef1e7ced2bd7e617..aae8de194693c39587e11a1d17fe7f617d8027c0 100644
--- a/ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.cc
+++ b/ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.cc
@@ -1319,7 +1319,10 @@ void DesktopDragDropClientAuraX11::CreateDragWidget(
     const gfx::ImageSkia& image) {
   Widget* widget = new Widget;
   Widget::InitParams params(Widget::InitParams::TYPE_DRAG);
-  params.opacity = Widget::InitParams::TRANSLUCENT_WINDOW;
+  if (ui::IsCompositingManagerPresent())
+    params.opacity = Widget::InitParams::TRANSLUCENT_WINDOW;
+  else
+    params.opacity = Widget::InitParams::OPAQUE_WINDOW;
   params.ownership = Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
   params.accept_events = false;
 
@@ -1329,7 +1332,8 @@ void DesktopDragDropClientAuraX11::CreateDragWidget(
   widget->set_focus_on_creation(false);
   widget->set_frame_type(Widget::FRAME_TYPE_FORCE_NATIVE);
   widget->Init(params);
-  widget->SetOpacity(kDragWidgetOpacity);
+  if (params.opacity == Widget::InitParams::TRANSLUCENT_WINDOW)
+    widget->SetOpacity(kDragWidgetOpacity);
   widget->GetNativeWindow()->SetName("DragWindow");
 
   drag_image_size_ = image.size();