Add support for single sample metrics.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 5f240939bd6b287f24c74995c3fe69e609443e94..bd14d4d55a22e3a5f4ac4c4fbb455f1feaa0ac6d 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -53,6 +53,7 @@
 #include "cc/base/switches.h"
 #include "cc/output/buffer_to_texture_target_map.h"
 #include "components/discardable_memory/service/discardable_shared_memory_manager.h"
+#include "components/metrics/single_sample_metrics_provider.h"
 #include "components/tracing/common/tracing_switches.h"
 #include "content/browser/appcache/appcache_dispatcher_host.h"
 #include "content/browser/appcache/chrome_appcache_service.h"
@@ -1325,6 +1326,9 @@ void RenderProcessHostImpl::RegisterMojoInterfaces() {
       base::Bind(&VideoCaptureHost::Create,
                  BrowserMainLoop::GetInstance()->media_stream_manager()));
 
+  registry->AddInterface(
+      base::Bind(&metrics::SingleSampleMetricsProvider::Create));
+
   if (base::FeatureList::IsEnabled(features::kOffMainThreadFetch)) {
     scoped_refptr<ServiceWorkerContextWrapper> service_worker_context(
         static_cast<ServiceWorkerContextWrapper*>(