Read compositor VSync information from platform, when possible

chrome/browser/chromeos/display/display_preferences.cc

 // Copyright (c) 2012 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 "chrome/browser/chromeos/display/display_preferences.h"
 
 #include "ash/display/display_layout_store.h"
 #include "ash/display/display_manager.h"
 #include "ash/display/display_pref_util.h"
 #include "ash/display/resolution_notification_controller.h"
@@ skipping 181 matching lines @@
     const gfx::Display& display = display_manager->GetDisplayAt(i);
     int64 id = display.id();
     ash::internal::DisplayInfo info = display_manager->GetDisplayInfo(id);
 
     scoped_ptr<base::DictionaryValue> property_value(
         new base::DictionaryValue());
     property_value->SetInteger("rotation", static_cast<int>(info.rotation()));
     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())
       InsetsToValue(info.overscan_insets_in_dip(), property_value.get());
     pref_data->Set(base::Int64ToString(id), property_value.release());
   }
 }
 
 typedef std::map<chromeos::DisplayPowerState, std::string>
     DisplayPowerStateToStringMap;
@@ skipping 83 matching lines @@
                                    const ash::DisplayLayout& layout) {
   StoreDisplayLayoutPref(std::make_pair(id1, id2), layout);
 }
 
 // Stores the given |power_state|.
 void StoreDisplayPowerStateForTest(DisplayPowerState power_state) {
   StoreDisplayPowerState(power_state);
 }
 
 }  // namespace chromeos