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

ui/ozone/platform/drm/gpu/drm_vsync_provider.cc

Index: ui/ozone/platform/drm/gpu/drm_vsync_provider.cc
diff --git a/ui/ozone/platform/drm/gpu/drm_vsync_provider.cc b/ui/ozone/platform/drm/gpu/drm_vsync_provider.cc
index e3c39252569aef74b263691e2f89151e886670ae..6c0e1ca0964b12c6726c016fe4d34d48877cff9e 100644
--- a/ui/ozone/platform/drm/gpu/drm_vsync_provider.cc
+++ b/ui/ozone/platform/drm/gpu/drm_vsync_provider.cc
@@ -5,6 +5,7 @@
 #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"
 
@@ -21,9 +22,11 @@ void DrmVSyncProvider::GetVSyncParameters(const UpdateVSyncCallback& callback) {
   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.
@@ -31,7 +34,7 @@ void DrmVSyncProvider::GetVSyncParameters(const UpdateVSyncCallback& callback) {
       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);
 }