Enable UMA log uploads for cellular networks.

components/metrics/metrics_service.h

Index: components/metrics/metrics_service.h
diff --git a/components/metrics/metrics_service.h b/components/metrics/metrics_service.h
index 904147454ed490eafc424edf046475a15db67d24..f51a8787f3cedb1b386d0b7b1208642d5c475f4f 100644
--- a/components/metrics/metrics_service.h
+++ b/components/metrics/metrics_service.h
@@ -27,6 +27,7 @@
 #include "components/metrics/metrics_log.h"
 #include "components/metrics/metrics_log_manager.h"
 #include "components/metrics/metrics_provider.h"
+#include "components/metrics/net/network_metrics_provider.h"
 #include "components/variations/active_field_trials.h"
 
 class MetricsServiceAccessor;
@@ -242,6 +243,11 @@ class MetricsService : public base::HistogramFlattener {
   // Clears the stability metrics that are saved in local state.
   void ClearSavedStabilityMetrics();
 
+  // Sets the pointer for network_metrics_provider for passing it through to
+  // scheduler when it is initialized.
+  void SetNetworkMetricsProvider(
+      metrics::NetworkMetricsProvider* network_metrics_provider);
+
  protected:
   // Exposed for testing.
   MetricsLogManager* log_manager() { return &log_manager_; }
@@ -481,6 +487,8 @@ class MetricsService : public base::HistogramFlattener {
   // exited-cleanly bit in the prefs.
   static ShutdownCleanliness clean_shutdown_status_;
 
+  const metrics::NetworkMetricsProvider* network_metrics_provider_;
+
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest, IsPluginProcess);
   FRIEND_TEST_ALL_PREFIXES(MetricsServiceTest,
                            PermutedEntropyCacheClearedWhenLowEntropyReset);