Read compositor VSync information from platform, when possible

chromeos/display/output_configurator.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 "chromeos/display/output_configurator.h"
 
 #include <X11/Xlib.h>
 #include <X11/extensions/Xrandr.h>
 #include <X11/extensions/XInput2.h>
 
@@ skipping 648 matching lines @@
 }
 
 void OutputConfigurator::UpdateCachedOutputs() {
   cached_outputs_ = delegate_->GetOutputs();
 
   // Set |selected_mode| fields.
   for (size_t i = 0; i < cached_outputs_.size(); ++i) {
     OutputSnapshot* output = &cached_outputs_[i];
     if (output->has_display_id) {
       int width = 0, height = 0;
+      float refresh_rate;
       if (state_controller_ &&
           state_controller_->GetResolutionForDisplayId(
-              output->display_id, &width, &height)) {
+              output->display_id, &width, &height, &refresh_rate)) {
         output->selected_mode =
             FindOutputModeMatchingSize(*output, width, height);
       }
     }
     // Fall back to native mode.
     if (output->selected_mode == None)
       output->selected_mode = output->native_mode;
   }
 
   // Set |mirror_mode| fields.
@@ skipping 463 matching lines @@
   float width_ratio = static_cast<float>(mirror_mode_info->width) /
       static_cast<float>(native_mode_info->width);
   float height_ratio = static_cast<float>(mirror_mode_info->height) /
       static_cast<float>(native_mode_info->height);
 
   area_ratio = width_ratio * height_ratio;
   return area_ratio;
 }
 
 }  // namespace chromeos