Read compositor VSync information from platform, when possible

chrome/browser/chromeos/display/display_preferences.cc

Index: chrome/browser/chromeos/display/display_preferences.cc
diff --git a/chrome/browser/chromeos/display/display_preferences.cc b/chrome/browser/chromeos/display/display_preferences.cc
index ab7697bde0ae4358ad98519c06c7b3670951d484..b41f056f351ed237873523a2a3b842aeace0e256 100644
--- a/chrome/browser/chromeos/display/display_preferences.cc
+++ b/chrome/browser/chromeos/display/display_preferences.cc
@@ -199,11 +199,12 @@ void StoreCurrentDisplayProperties() {
     property_value->SetInteger(
         "ui-scale",
         static_cast<int>(info.configured_ui_scale() * 1000));
-    gfx::Size resolution;
+    ash::internal::DisplayMode mode;
     if (!display.IsInternal() &&
-        display_manager->GetSelectedResolutionForDisplayId(id, &resolution)) {
-      property_value->SetInteger("width", resolution.width());
-      property_value->SetInteger("height", resolution.height());
+        display_manager->GetSelectedModeForDisplayId(id, &mode) &&
+        !mode.native) {
+      property_value->SetInteger("width", mode.size.width());
+      property_value->SetInteger("height", mode.size.height());
     }
 
     if (!info.overscan_insets_in_dip().empty())