Enable UMA log uploads for cellular networks.

components/metrics/net/network_metrics_provider.cc

Index: components/metrics/net/network_metrics_provider.cc
diff --git a/components/metrics/net/network_metrics_provider.cc b/components/metrics/net/network_metrics_provider.cc
index e845cde5bd511a69bccd4ec4a3f6c5e956bebe17..ab0e804938e92eb3ff2888aa56d6e36ada194818 100644
--- a/components/metrics/net/network_metrics_provider.cc
+++ b/components/metrics/net/network_metrics_provider.cc
@@ -227,4 +227,27 @@ void NetworkMetricsProvider::WriteWifiAccessPointProto(
   }
 }
 
+bool NetworkMetricsProvider::IsCellularConnection() {
+  switch (GetConnectionType()) {
+    case SystemProfileProto_Network_ConnectionType_CONNECTION_2G:
+    case SystemProfileProto_Network_ConnectionType_CONNECTION_3G:
+    case SystemProfileProto_Network_ConnectionType_CONNECTION_4G:
+      return true;
+    default:
+      return false;
+  }
+}
+
+void NetworkMetricsProvider::GetIsCellularConnection(bool* is_cellular_out) {
+  *is_cellular_out = IsCellularConnection();
+}
+
+base::Callback<void(bool*)> NetworkMetricsProvider::GetConnectionCallback() {
+  base::Callback<void(bool*)> cellular_callback =
+      base::Bind(&NetworkMetricsProvider::GetIsCellularConnection,
+                 weak_ptr_factory_.GetWeakPtr());
+
+  return cellular_callback;
+}
+
 }  // namespace metrics