[Ozone-DRM] Use CRTC's mode when configuring it for mirror mode

ui/ozone/platform/drm/gpu/drm_vsync_provider.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/gpu/drm_vsync_provider.h"
 
 #include "base/time/time.h"
+#include "ui/ozone/platform/drm/gpu/crtc_controller.h"
 #include "ui/ozone/platform/drm/gpu/drm_window.h"
 #include "ui/ozone/platform/drm/gpu/hardware_display_controller.h"
 
 namespace ui {
 
 DrmVSyncProvider::DrmVSyncProvider(DrmWindow* window) : window_(window) {
 }
 
 DrmVSyncProvider::~DrmVSyncProvider() {
 }
 
 void DrmVSyncProvider::GetVSyncParameters(const UpdateVSyncCallback& callback) {
   HardwareDisplayController* controller = window_->GetController();
   if (!controller)
     return;
 
+  // If we're in mirror mode the 2 CRTCs should have similar modes with the same
+  // refresh rates.
+  CrtcController* crtc = controller->crtc_controllers()[0];
   // The value is invalid, so we can't update the parameters.
-  if (controller->GetTimeOfLastFlip() == 0 ||
-      controller->get_mode().vrefresh == 0)
+  if (controller->GetTimeOfLastFlip() == 0 || crtc->mode().vrefresh == 0)
     return;
 
   // Stores the time of the last refresh.
   base::TimeTicks timebase =
       base::TimeTicks::FromInternalValue(controller->GetTimeOfLastFlip());
   // Stores the refresh rate.
   base::TimeDelta interval =
-      base::TimeDelta::FromSeconds(1) / controller->get_mode().vrefresh;
+      base::TimeDelta::FromSeconds(1) / crtc->mode().vrefresh;
 
   callback.Run(timebase, interval);
 }
 
 }  // namespace ui