Make tooltips toplevel windows on Linux

ui/views/widget/desktop_aura/desktop_native_widget_aura.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/desktop_aura/desktop_native_widget_aura.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/cursor_client.h"
@@ skipping 281 matching lines @@
   {
     aura::Window* capture_window = capture_client_->GetCaptureWindow();
     if (capture_window && host_->window()->Contains(capture_window))
       capture_window->ReleaseCapture();
   }
 
   // DesktopWindowTreeHost owns the ActivationController which ShadowController
   // references. Make sure we destroy ShadowController early on.
   shadow_controller_.reset();
   tooltip_manager_.reset();
-  host_->window()->RemovePreTargetHandler(tooltip_controller_.get());
-  aura::client::SetTooltipClient(host_->window(), NULL);
-  tooltip_controller_.reset();
+  if (tooltip_controller_.get()) {
+    host_->window()->RemovePreTargetHandler(tooltip_controller_.get());
+    aura::client::SetTooltipClient(host_->window(), NULL);
+    tooltip_controller_.reset();
+  }
 
   root_window_event_filter_->RemoveHandler(input_method_event_filter_.get());
 
   window_tree_client_.reset();  // Uses host_->dispatcher() at destruction.
 
   capture_client_.reset();  // Uses host_->dispatcher() at destruction.
 
   // FocusController uses |content_window_|. Destroy it now so that we don't
   // have to worry about the possibility of FocusController attempting to use
   // |content_window_| after it's been destroyed but before all child windows
@@ skipping 174 matching lines @@
 
   OnHostResized(host());
 
   host_->AddObserver(this);
 
   window_tree_client_.reset(
       new DesktopNativeWidgetAuraWindowTreeClient(host_->window()));
   drop_helper_.reset(new DropHelper(GetWidget()->GetRootView()));
   aura::client::SetDragDropDelegate(content_window_, this);
 
-  tooltip_manager_.reset(new TooltipManagerAura(GetWidget()));
-
-  tooltip_controller_.reset(
-      new corewm::TooltipController(
-          desktop_window_tree_host_->CreateTooltip()));
-  aura::client::SetTooltipClient(host_->window(),
-                                 tooltip_controller_.get());
-  host_->window()->AddPreTargetHandler(tooltip_controller_.get());
+  if (params.type != Widget::InitParams::TYPE_TOOLTIP) {
+    tooltip_manager_.reset(new TooltipManagerAura(GetWidget()));
+    tooltip_controller_.reset(
+        new corewm::TooltipController(
+            desktop_window_tree_host_->CreateTooltip()));
+    aura::client::SetTooltipClient(host_->window(),
+                                   tooltip_controller_.get());
+    host_->window()->AddPreTargetHandler(tooltip_controller_.get());
+  }
 
   if (params.opacity == Widget::InitParams::TRANSLUCENT_WINDOW) {
     visibility_controller_.reset(new wm::VisibilityController);
     aura::client::SetVisibilityClient(host_->window(),
                                       visibility_controller_.get());
     wm::SetChildWindowVisibilityChangesAnimated(host_->window());
     wm::SetChildWindowVisibilityChangesAnimated(
         content_window_container_);
   }
 
@@ skipping 688 matching lines @@
   if (cursor_reference_count_ == 0) {
     // We are the last DesktopNativeWidgetAura instance, and we are responsible
     // for cleaning up |cursor_manager_|.
     delete cursor_manager_;
     native_cursor_manager_ = NULL;
     cursor_manager_ = NULL;
   }
 }
 
 }  // namespace views