Record device scale factor in the metrics log

chrome/browser/metrics/metrics_log.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/metrics/metrics_log.h"
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 325 matching lines @@
 }
 
 PrefService* MetricsLog::GetPrefService() {
   return g_browser_process->local_state();
 }
 
 gfx::Size MetricsLog::GetScreenSize() const {
   return gfx::Screen::GetPrimaryDisplay().GetSizeInPixel();
 }
 
+float MetricsLog::GetScreenDeviceScaleFactor() const {
+  return gfx::Screen::GetPrimaryDisplay().device_scale_factor();
+}
+
 int MetricsLog::GetScreenCount() const {
   return gfx::Screen::GetNumDisplays();
 }
 
 void MetricsLog::GetFieldTrialIds(
     std::vector<SelectedGroupId>* field_trial_ids) const {
   chrome_variations::GetFieldTrialSelectedGroupIds(field_trial_ids);
 }
 
 void MetricsLog::WriteStabilityElement(
@@ skipping 424 matching lines @@
   gpu->set_driver_date(gpu_info.driver_date);
   SystemProfileProto::Hardware::Graphics::PerformanceStatistics*
       gpu_performance = gpu->mutable_performance_statistics();
   gpu_performance->set_graphics_score(gpu_info.performance_stats.graphics);
   gpu_performance->set_gaming_score(gpu_info.performance_stats.gaming);
   gpu_performance->set_overall_score(gpu_info.performance_stats.overall);
 
   const gfx::Size display_size = GetScreenSize();
   hardware->set_primary_screen_width(display_size.width());
   hardware->set_primary_screen_height(display_size.height());
+  hardware->set_primary_screen_scale_factor(GetScreenDeviceScaleFactor());
   hardware->set_screen_count(GetScreenCount());
 
   WriteGoogleUpdateProto(google_update_metrics);
 
   bool write_as_xml = false;
   WritePluginList(plugin_list, write_as_xml);
 
   std::vector<SelectedGroupId> field_trial_ids;
   GetFieldTrialIds(&field_trial_ids);
   WriteFieldTrials(field_trial_ids, system_profile);
@@ skipping 200 matching lines @@
     ProductDataToProto(google_update_metrics.google_update_data,
                        google_update->mutable_google_update_status());
   }
 
   if (!google_update_metrics.product_data.version.empty()) {
     ProductDataToProto(google_update_metrics.product_data,
                        google_update->mutable_client_status());
   }
 #endif  // defined(GOOGLE_CHROME_BUILD) && defined(OS_WIN)
 }