Update diplays even if configuration failed during startup

ash/display/display_change_observer_chromeos.cc

 // Copyright 2013 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 "ash/display/display_change_observer_chromeos.h"
 
 #include <algorithm>
 #include <map>
 #include <set>
 #include <string>
@@ skipping 237 matching lines @@
   Shell::GetInstance()->display_manager()->OnNativeDisplaysChanged(displays);
 
   // For the purposes of user activity detection, ignore synthetic mouse events
   // that are triggered by screen resizes: http://crbug.com/360634
   ui::UserActivityDetector* user_activity_detector =
       ui::UserActivityDetector::Get();
   if (user_activity_detector)
     user_activity_detector->OnDisplayPowerChanging();
 }
 
+void DisplayChangeObserver::OnDisplayModeChangeFailed(
+    const ui::DisplayConfigurator::DisplayStateList& displays,
+    ui::MultipleDisplayState failed_new_state) {
+  // If display configuration failed during startup, simply update the display
+  // manager with detected displays. If no display is detected, it will
+  // create a pseudo display.
+  if (Shell::GetInstance()->display_manager()->GetNumDisplays() == 0)
+    OnDisplayModeChanged(displays);
+}
+
 void DisplayChangeObserver::OnAppTerminating() {
 #if defined(USE_ASH)
   // Stop handling display configuration events once the shutdown
   // process starts. crbug.com/177014.
   Shell::GetInstance()->display_configurator()->PrepareForExit();
 #endif
 }
 
 // static
 float DisplayChangeObserver::FindDeviceScaleFactor(float dpi) {
@@ skipping 12 matching lines @@
 void DisplayChangeObserver::OnKeyboardDeviceConfigurationChanged() {
 }
 
 void DisplayChangeObserver::OnMouseDeviceConfigurationChanged() {
 }
 
 void DisplayChangeObserver::OnTouchpadDeviceConfigurationChanged() {
 }
 
 }  // namespace ash