ozone: Directly provide size of active mode from HardwareDisplayController

ui/ozone/platform/dri/hardware_display_controller.cc

Index: ui/ozone/platform/dri/hardware_display_controller.cc
diff --git a/ui/ozone/platform/dri/hardware_display_controller.cc b/ui/ozone/platform/dri/hardware_display_controller.cc
index 4befd8fa80128740814f37ece9816ce97a8e59f1..cead9494f3331ac28920a63c2c33e915f260e0e2 100644
--- a/ui/ozone/platform/dri/hardware_display_controller.cc
+++ b/ui/ozone/platform/dri/hardware_display_controller.cc
@@ -258,6 +258,10 @@ bool HardwareDisplayController::IsDisabled() const {
   return is_disabled_;
 }
 
+gfx::Size HardwareDisplayController::GetModeSize() const {
+  return gfx::Size(mode_.hdisplay, mode_.vdisplay);
+}
+
 bool HardwareDisplayController::ModesetCrtc(
     const scoped_refptr<ScanoutBuffer>& buffer,
     drmModeModeInfo mode,