Make tooltips toplevel windows on Linux

ui/views/widget/widget.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/widget.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 318 matching lines @@
   return type == InitParams::TYPE_WINDOW ||
          type == InitParams::TYPE_PANEL ||
          type == InitParams::TYPE_BUBBLE;
 }
 
 void Widget::Init(const InitParams& in_params) {
   TRACE_EVENT0("views", "Widget::Init");
   InitParams params = in_params;
 
   params.child |= (params.type == InitParams::TYPE_CONTROL);
-  is_top_level_ = (!params.child && params.type != InitParams::TYPE_TOOLTIP);
+  is_top_level_ = !params.child;
 
   if (params.activatable != InitParams::ACTIVATABLE_DEFAULT) {
     can_activate_ = (params.activatable == InitParams::ACTIVATABLE_YES);
   } else if (params.type != InitParams::TYPE_CONTROL &&
              params.type != InitParams::TYPE_POPUP &&
              params.type != InitParams::TYPE_MENU &&
              params.type != InitParams::TYPE_TOOLTIP &&
              params.type != InitParams::TYPE_DRAG) {
     can_activate_ = true;
     params.activatable = InitParams::ACTIVATABLE_YES;
@@ skipping 1166 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // internal::NativeWidgetPrivate, NativeWidget implementation:
 
 internal::NativeWidgetPrivate* NativeWidgetPrivate::AsNativeWidgetPrivate() {
   return this;
 }
 
 }  // namespace internal
 }  // namespace views