Support persistent system profiles.

chrome/browser/chrome_browser_field_trials.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/chrome_browser_field_trials.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/feature_list.h"
 #include "base/files/file_util.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram_base.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/persistent_histogram_allocator.h"
 #include "base/path_service.h"
 #include "base/strings/string_util.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "chrome/browser/metrics/chrome_metrics_service_client.h"
 #include "chrome/browser/metrics/chrome_metrics_services_manager_client.h"
 #include "chrome/browser/tracing/background_tracing_field_trial.h"
 #include "chrome/common/channel_info.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "components/metrics/metrics_pref_names.h"
+#include "components/metrics/persistent_system_profile.h"
 #include "components/variations/variations_associated_data.h"
 
 #if defined(OS_ANDROID)
 #include "chrome/browser/chrome_browser_field_trials_mobile.h"
 #else
 #include "chrome/browser/chrome_browser_field_trials_desktop.h"
 #endif
 
 namespace {
 
@@ skipping 76 matching lines @@
   // Get the allocator that was just created and report result. Exit if the
   // allocator could not be created.
   UMA_HISTOGRAM_ENUMERATION("UMA.PersistentHistograms.InitResult", result,
                             INIT_RESULT_MAX);
 
   base::GlobalHistogramAllocator* allocator =
       base::GlobalHistogramAllocator::Get();
   if (!allocator)
     return;
 
+  // Store a copy of the system profile in this allocator.
+  metrics::GlobalPersistentSystemProfile::GetInstance()
+      ->RegisterPersistentAllocator(allocator->memory_allocator());
+
   // Create tracking histograms for the allocator and record storage file.
   allocator->CreateTrackingHistograms(
       ChromeMetricsServiceClient::kBrowserMetricsName);
 }
 
 // Create a field trial to control metrics/crash sampling for Stable on
 // Windows/Android if no variations seed was applied.
 void CreateFallbackSamplingTrialIfNeeded(bool has_seed,
                                          base::FeatureList* feature_list) {
 #if defined(OS_WIN) || defined(OS_ANDROID)
@@ skipping 32 matching lines @@
     bool has_seed,
     base::FeatureList* feature_list) {
   CreateFallbackSamplingTrialIfNeeded(has_seed, feature_list);
 }
 
 void ChromeBrowserFieldTrials::InstantiateDynamicTrials() {
   // Persistent histograms must be enabled as soon as possible.
   InstantiatePersistentHistograms();
   tracing::SetupBackgroundTracingFieldTrial();
 }