Support persistent system profiles.

chrome/browser/chrome_browser_field_trials.cc

Index: chrome/browser/chrome_browser_field_trials.cc
diff --git a/chrome/browser/chrome_browser_field_trials.cc b/chrome/browser/chrome_browser_field_trials.cc
index 904a12136d5559d03cf9ad480fe829a8b15ea30f..c2da21216a6eff793faddd0ffe487e8f3c2028f2 100644
--- a/chrome/browser/chrome_browser_field_trials.cc
+++ b/chrome/browser/chrome_browser_field_trials.cc
@@ -24,6 +24,7 @@
 #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)
@@ -120,6 +121,10 @@ void InstantiatePersistentHistograms() {
   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);