Enable UMA log uploads for cellular networks.

components/metrics/net/network_metrics_provider.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/metrics/net/network_metrics_provider.h"
 
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 209 matching lines @@
        it != oui_list.end();
        ++it) {
     uint32 oui;
     if (base::HexStringToUInt(*it, &oui))
       vendor->add_element_identifier(oui);
     else
       NOTREACHED();
   }
 }
 
+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