Merge histograms from providers into StatisticsRecorder for display.

chrome/browser/metrics/subprocess_metrics_provider.cc

Index: chrome/browser/metrics/subprocess_metrics_provider.cc
diff --git a/chrome/browser/metrics/subprocess_metrics_provider.cc b/chrome/browser/metrics/subprocess_metrics_provider.cc
index d36e847f0e00668d8e756c0dee8d04d92ca5a98e..bb5ecca9a812af484fdd1f035e0cfaf00704602f 100644
--- a/chrome/browser/metrics/subprocess_metrics_provider.cc
+++ b/chrome/browser/metrics/subprocess_metrics_provider.cc
@@ -30,6 +30,8 @@ SubprocessMetricsProvider* g_subprocess_metrics_provider_for_testing;
 
 SubprocessMetricsProvider::SubprocessMetricsProvider()
     : scoped_observer_(this), weak_ptr_factory_(this) {
+  base::StatisticsRecorder::RegisterHistogramProvider(
+      weak_ptr_factory_.GetWeakPtr());
   content::BrowserChildProcessObserver::Add(this);
   registrar_.Add(this, content::NOTIFICATION_RENDERER_PROCESS_CREATED,
                  content::NotificationService::AllBrowserContextsAndSources());