Create a field trial to test if we can detect good QPC implementations.

chrome/browser/metrics/metrics_service.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.
 
 //------------------------------------------------------------------------------
 // Description of the life cycle of a instance of MetricsService.
 //
 //  OVERVIEW
 //
 // A MetricsService instance is typically created at application startup.  It is
@@ skipping 161 matching lines @@
 #include "base/values.h"
 #include "chrome/browser/autocomplete/autocomplete_log.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/process_map.h"
 #include "chrome/browser/io_thread.h"
 #include "chrome/browser/memory_details.h"
 #include "chrome/browser/metrics/metrics_log.h"
 #include "chrome/browser/metrics/metrics_log_serializer.h"
 #include "chrome/browser/metrics/metrics_reporting_scheduler.h"
+#include "chrome/browser/metrics/time_ticks_experiment_win.h"
 #include "chrome/browser/metrics/tracking_synchronizer.h"
 #include "chrome/browser/net/http_pipelining_compatibility_client.h"
 #include "chrome/browser/net/network_stats.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search_engines/template_url_service.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_otr_state.h"
 #include "chrome/common/child_process_logging.h"
 #include "chrome/common/chrome_process_type.h"
@@ skipping 1286 matching lines @@
   // don't consider that a sign that the server is in trouble.
   bool server_is_healthy = upload_succeeded || response_code == 400;
   scheduler_->UploadFinished(server_is_healthy, log_manager_.has_unsent_logs());
 
   // Collect network stats if UMA upload succeeded.
   IOThread* io_thread = g_browser_process->io_thread();
   if (server_is_healthy && io_thread) {
     chrome_browser_net::CollectNetworkStats(network_stats_server_, io_thread);
     chrome_browser_net::CollectPipeliningCapabilityStatsOnUIThread(
         http_pipelining_test_server_, io_thread);
+#if defined(OS_WIN)
+    chrome::CollectTimeTicksStats();
+#endif
   }
 }
 
 void MetricsService::LogWindowOrTabChange(int type, uintptr_t window_or_tab) {
   int controller_id = -1;
   MetricsLog::WindowEventType window_type;
 
   // Note: since we stop all logging when a single OTR session is active, it is
   // possible that we start getting notifications about a window that we don't
   // know about.
@@ skipping 306 matching lines @@
   if (local_state) {
     const PrefService::Preference* uma_pref =
         local_state->FindPreference(prefs::kMetricsReportingEnabled);
     if (uma_pref) {
       bool success = uma_pref->GetValue()->GetAsBoolean(&result);
       DCHECK(success);
     }
   }
   return result;
 }