mus: Use TooltipManagerAura in NativeWidgetMus.

ui/views/mus/screen_mus.cc

 // Copyright 2016 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.
 
 // This has to be before any other includes, else default is picked up.
 // See base/logging for details on this.
 #define NOTIMPLEMENTED_POLICY 5
 
 #include "ui/views/mus/screen_mus.h"
 
 #include "services/shell/public/cpp/connection.h"
 #include "services/shell/public/cpp/connector.h"
 #include "ui/aura/window.h"
+#include "ui/views/mus/native_widget_mus.h"
 #include "ui/views/mus/screen_mus_delegate.h"
 #include "ui/views/mus/window_manager_frame_values.h"
 
 namespace mojo {
 
 template <>
 struct TypeConverter<views::WindowManagerFrameValues,
                      ui::mojom::FrameDecorationValuesPtr> {
   static views::WindowManagerFrameValues Convert(
       const ui::mojom::FrameDecorationValuesPtr& input) {
@@ skipping 50 matching lines @@
   }
 
   return delegate_->GetCursorScreenPoint();
 }
 
 bool ScreenMus::IsWindowUnderCursor(gfx::NativeWindow window) {
   return window && window->IsVisible() &&
          window->GetBoundsInScreen().Contains(GetCursorScreenPoint());
 }
 
+gfx::NativeWindow ScreenMus::GetWindowAtScreenPoint(const gfx::Point& point) {
+  aura::Window* aura_window = nullptr;
+  ui::Window* ui_window = delegate_->GetWindowAtScreenPoint(point);
+  if (ui_window) {
+    NativeWidgetMus* nw_mus = NativeWidgetMus::GetForWindow(ui_window);
+    if (nw_mus)
+      aura_window =
+          static_cast<internal::NativeWidgetPrivate*>(nw_mus)->GetNativeView();

[Elliot Glaysher, 2016/10/04 22:27:19]

AFAICT based on the windows implementation of GetWindowAtScreenPoint, we
*aren't* supposed to recurse into |aura_window|. This method is supposed to
return the toplevel content window associated with the native widget.

+  }
+  return aura_window;
+}
+
 void ScreenMus::OnDisplays(mojo::Array<ui::mojom::WsDisplayPtr> ws_displays) {
   // This should only be called once from Init() before any observers have been
   // added.
   DCHECK(display_list()->displays().empty());
   for (size_t i = 0; i < ws_displays.size(); ++i) {
     const bool is_primary = ws_displays[i]->is_primary;
     display_list()->AddDisplay(ws_displays[i]->display,
                                is_primary
                                    ? display::DisplayList::Type::PRIMARY
                                    : display::DisplayList::Type::NOT_PRIMARY);
@@ skipping 22 matching lines @@
         delegate_->OnWindowManagerFrameValuesChanged();
     }
   }
 }
 
 void ScreenMus::OnDisplayRemoved(int64_t id) {
   display_list()->RemoveDisplay(id);
 }
 
 }  // namespace views