Add IPv4/IPv6 counters to UMA even when count is 0.

content/renderer/p2p/ipc_network_manager.cc

 // Copyright (c) 2012 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 "content/renderer/p2p/ipc_network_manager.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/sys_byteorder.h"
@@ skipping 87 matching lines @@
         talk_base::Network* network = new talk_base::Network(
             it->name, it->name, ip6_addr, 64,
             ConvertConnectionTypeToAdapterType(it->type));
         network->AddIP(ip6_addr);
         networks.push_back(network);
         ++ipv6_interfaces;
       }
     }
   }
 
-  if (ipv4_interfaces > 0) {
-    UMA_HISTOGRAM_COUNTS_100("WebRTC.PeerConnection.IPv4Interfaces",
-                             ipv4_interfaces);
-  }
 
-  if (ipv6_interfaces > 0) {
-    UMA_HISTOGRAM_COUNTS_100("WebRTC.PeerConnection.IPv6Interfaces",
-                             ipv6_interfaces);
-  }
+  // Send interface counts to UMA.
+  UMA_HISTOGRAM_COUNTS_100("WebRTC.PeerConnection.IPv4Interfaces",
+                           ipv4_interfaces);
+  UMA_HISTOGRAM_COUNTS_100("WebRTC.PeerConnection.IPv6Interfaces",
+                           ipv6_interfaces);
 
   if (CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kAllowLoopbackInPeerConnection)) {
     std::string name_v4("loopback_ipv4");
     talk_base::IPAddress ip_address_v4(INADDR_LOOPBACK);
     talk_base::Network* network_v4 = new talk_base::Network(
         name_v4, name_v4, ip_address_v4, 32, talk_base::ADAPTER_TYPE_UNKNOWN);
     network_v4->AddIP(ip_address_v4);
     networks.push_back(network_v4);
 
     std::string name_v6("loopback_ipv6");
     talk_base::IPAddress ip_address_v6(in6addr_loopback);
     talk_base::Network* network_v6 = new talk_base::Network(
         name_v6, name_v6, ip_address_v6, 64, talk_base::ADAPTER_TYPE_UNKNOWN);
     network_v6->AddIP(ip_address_v6);
     networks.push_back(network_v6);
   }
 
   bool changed = false;
   MergeNetworkList(networks, &changed);
   if (changed)
     SignalNetworksChanged();
 }
 
 void IpcNetworkManager::SendNetworksChangedSignal() {
   SignalNetworksChanged();
 }
 
 }  // namespace content