Enable UMA log uploads for cellular networks.

components/metrics/metrics_reporting_scheduler.h

Index: components/metrics/metrics_reporting_scheduler.h
diff --git a/components/metrics/metrics_reporting_scheduler.h b/components/metrics/metrics_reporting_scheduler.h
index 19f07570663727eb2c8c259b91fb073fd0477e8d..ddfe651d3ee29f3f87b26fbd729ed723592fc635 100644
--- a/components/metrics/metrics_reporting_scheduler.h
+++ b/components/metrics/metrics_reporting_scheduler.h
@@ -10,13 +10,19 @@
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
+#include "components/metrics/net/network_metrics_provider.h"
 
 namespace metrics {
 
 // Scheduler task to drive a MetricsService object's uploading.
 class MetricsReportingScheduler {
  public:
-  explicit MetricsReportingScheduler(const base::Closure& upload_callback);
+  // Creates MetricsServiceScheduler object with the given |upload_callback|
+  // callback to call when uploading should happen and |cellular_callback|
+  // callback to get current network connection type.
+  MetricsReportingScheduler(
+      const base::Closure& upload_callback,
+      const base::Callback<void(bool*)>& cellular_callback);
   ~MetricsReportingScheduler();
 
   // Starts scheduling uploads. This in a no-op if the scheduler is already
@@ -84,6 +90,9 @@ class MetricsReportingScheduler {
   // has been completed.
   bool waiting_for_init_task_complete_;
 
+  // Callback function used to get current network connection type.
+  base::Callback<void(bool*)> cellular_callback_;
+
   DISALLOW_COPY_AND_ASSIGN(MetricsReportingScheduler);
 };