Add UMA to report Preferences File Corruption

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index d0428ebea06a70c8d060145251f218d18bb23e94..4bdd9d08b26bb26d09e091bcbbbc9858a0e88c47 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -52,6 +52,7 @@
 #include "chrome/browser/pepper_flash_settings_manager.h"
 #include "chrome/browser/plugins/plugin_finder.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
+#include "chrome/browser/prefs/pref_metrics_service.h"
 #include "chrome/browser/prefs/pref_service_syncable.h"
 #include "chrome/browser/prefs/session_startup_pref.h"
 #include "chrome/browser/printing/cloud_print/cloud_print_url.h"
@@ -215,6 +216,7 @@ void RegisterLocalState(PrefRegistrySimple* registry) {
   MetricsLog::RegisterPrefs(registry);
   MetricsService::RegisterPrefs(registry);
   metrics::CachingPermutedEntropyProvider::RegisterPrefs(registry);
+  PrefMetricsService::RegisterPrefs(registry);
   PrefProxyConfigTrackerImpl::RegisterPrefs(registry);
   ProfileInfoCache::RegisterPrefs(registry);
   profiles::RegisterPrefs(registry);