Starting a refactor to allow adding metrics on upload.

components/metrics/metrics_service.cc

Index: components/metrics/metrics_service.cc
diff --git a/components/metrics/metrics_service.cc b/components/metrics/metrics_service.cc
index b6bb8f548f8a2e2ddf5d74eacab5b7f5d0f68d6e..7504a4f0611083b3755bbfc84fe48292df6daacd 100644
--- a/components/metrics/metrics_service.cc
+++ b/components/metrics/metrics_service.cc
@@ -849,6 +849,9 @@ void MetricsService::StartScheduledUpload() {
     log_manager_.StageNextLogForUpload();
     SendStagedLog();
   } else {
+    for (size_t i = 0; i < metrics_providers_.size(); ++i)
+      metrics_providers_[i]->OnCollectFinalMetrics();
+
     client_->CollectFinalMetrics(
         base::Bind(&MetricsService::OnFinalLogInfoCollectionDone,
                    self_ptr_factory_.GetWeakPtr()));