chromeos: Turn off displays on suspend

ui/ozone/platform/drm/host/drm_native_display_delegate.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/drm/host/drm_native_display_delegate.h"
 
 #include "ui/display/types/display_snapshot.h"
 #include "ui/display/types/native_display_observer.h"
 #include "ui/ozone/platform/drm/host/drm_display_host.h"
 #include "ui/ozone/platform/drm/host/drm_display_host_manager.h"
@@ skipping 36 matching lines @@
 
 void DrmNativeDisplayDelegate::SyncWithServer() {
 }
 
 void DrmNativeDisplayDelegate::SetBackgroundColor(uint32_t color_argb) {
 }
 
 void DrmNativeDisplayDelegate::ForceDPMSOn() {
 }
 
+void DrmNativeDisplayDelegate::GetCachedDisplays(
+    const GetDisplaysCallback& callback) {
+  display_manager_->GetCachedDisplays(callback);
+}
+
 void DrmNativeDisplayDelegate::GetDisplays(
     const GetDisplaysCallback& callback) {
   display_manager_->UpdateDisplays(callback);
 }
 
 void DrmNativeDisplayDelegate::AddMode(const ui::DisplaySnapshot& output,
                                        const ui::DisplayMode* mode) {
 }
 
 void DrmNativeDisplayDelegate::Configure(const ui::DisplaySnapshot& output,
@@ skipping 47 matching lines @@
 
 void DrmNativeDisplayDelegate::AddObserver(NativeDisplayObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void DrmNativeDisplayDelegate::RemoveObserver(NativeDisplayObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 }  // namespace ui