mus: Use TooltipManagerAura in NativeWidgetMus.

ui/views/mus/window_manager_connection.cc

 // Copyright 2015 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/mus/window_manager_connection.h"
 
 #include <set>
 #include <utility>
 
 #include "base/lazy_instance.h"
@@ skipping 149 matching lines @@
 
 void WindowManagerConnection::OnWindowManagerFrameValuesChanged() {
   if (client_)
     NativeWidgetMus::NotifyFrameChanged(client_.get());
 }
 
 gfx::Point WindowManagerConnection::GetCursorScreenPoint() {
   return client_->GetCursorScreenPoint();
 }
 
+ui::Window* WindowManagerConnection::GetWindowAtScreenPoint(
+    const gfx::Point& point) {
+  for (ui::Window* root : GetRoots()) {
+    if (root->bounds().Contains(point))

[sky, 2016/10/05 16:10:52]

Don't you want to recurse? Also, you should offset by the bounds of the display
the window is on.

[Elliot Glaysher, 2016/10/06 18:00:08]

Done.

+      return root;
+  }
+  return nullptr;
+}
+
 std::unique_ptr<OSExchangeData::Provider>
 WindowManagerConnection::BuildProvider() {
   return base::MakeUnique<OSExchangeDataProviderMus>();
 }
 
 }  // namespace views