Perform a display configuration in software mirror on hotplug event

ui/display/chromeos/update_display_configuration_task.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/display/chromeos/update_display_configuration_task.h"
 
 #include "ui/display/chromeos/configure_displays_task.h"
 #include "ui/display/chromeos/display_layout_manager.h"
 #include "ui/display/chromeos/display_util.h"
 #include "ui/display/types/display_snapshot.h"
@@ skipping 93 matching lines @@
   bool success = status != ConfigureDisplaysTask::ERROR;
   if (new_display_state_ == MULTIPLE_DISPLAY_STATE_DUAL_MIRROR &&
       status == ConfigureDisplaysTask::PARTIAL_SUCCESS)
     success = false;
 
   if (layout_manager_->GetSoftwareMirroringController()) {
     bool enable_software_mirroring = false;
     if (!success && new_display_state_ == MULTIPLE_DISPLAY_STATE_DUAL_MIRROR) {
       if (layout_manager_->GetDisplayState() !=
               MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED ||
-          layout_manager_->GetPowerState() != new_power_state_) {
+          layout_manager_->GetPowerState() != new_power_state_ ||
+          force_configure_) {
         new_display_state_ = MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED;
         EnterState(base::Bind(
             &UpdateDisplayConfigurationTask::OnEnableSoftwareMirroring,
             weak_ptr_factory_.GetWeakPtr()));
         return;
       }
 
       success = layout_manager_->GetDisplayState() ==
                 MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED;
       enable_software_mirroring = success;
@@ skipping 77 matching lines @@
         return layout_manager_->GetStateController()->GetStateForDisplayIds(
             display_ids);
       }
       NOTREACHED();
     }
   }
   return MULTIPLE_DISPLAY_STATE_INVALID;
 }
 
 }  // namespace ui