Add display task to trigger display configuration

ui/ozone/platform/dri/native_display_delegate_dri.cc

 // Copyright 2014 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/ozone/platform/dri/native_display_delegate_dri.h"
 
 #include "base/bind.h"
 #include "ui/display/types/native_display_observer.h"
 #include "ui/events/ozone/device/device_event.h"
 #include "ui/ozone/platform/dri/display_mode_dri.h"
@@ skipping 144 matching lines @@
                          display->modes().end());
   }
 
   NotifyScreenManager(cached_displays_.get(), old_displays.get());
 
   std::vector<DisplaySnapshot*> generic_displays(cached_displays_.begin(),
                                                  cached_displays_.end());
   return generic_displays;
 }
 
+void NativeDisplayDelegateDri::GetDisplays(
+    const GetDisplaysCallback& callback) {
+  callback.Run(GetDisplays());
+}
+
 void NativeDisplayDelegateDri::AddMode(const DisplaySnapshot& output,
                                        const DisplayMode* mode) {
 }
 
 bool NativeDisplayDelegateDri::Configure(const DisplaySnapshot& output,
                                          const DisplayMode* mode,
                                          const gfx::Point& origin) {
   const DisplaySnapshotDri& dri_output =
       static_cast<const DisplaySnapshotDri&>(output);
 
@@ skipping 127 matching lines @@
         std::find_if(old_displays.begin(), old_displays.end(),
                      DisplaySnapshotComparator(new_displays[i]));
 
     if (it == old_displays.end())
       screen_manager_->AddDisplayController(dri_, new_displays[i]->crtc(),
                                             new_displays[i]->connector());
   }
 }
 
 }  // namespace ui