Revert 272379 "Revert 272371 "Add UMA Counts for number of IPv4 ..."

Build failure looks like it was actually unrelated.

> Revert 272371 "Add UMA Counts for number of IPv4 and IPv6 interf..."
>
> Reason: build failure on Mac ASan 64
>
> > Add UMA Counts for number of IPv4 and IPv6 interfaces detected for PeerConnection.
> >
> > R=sergeyu@chromium.org
> > BUG=N/A
> >
> > Review URL: https://codereview.chromium.org/299103002
>
> TBR=mallinath@chromium.org
>
> Review URL: https://codereview.chromium.org/299843008

TBR=mallinath@chromium.org

Review URL: https://codereview.chromium.org/296903010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272564 0039d316-1c4b-4281-b951-d872f2087c98

content/renderer/p2p/ipc_network_manager.cc

@@ -6,6 +6,7 @@
 
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "base/metrics/histogram.h"
 #include "base/sys_byteorder.h"
 #include "content/public/common/content_switches.h"
 #include "net/base/net_util.h"
@@ -75,6 +76,8 @@ void IpcNetworkManager::OnNetworkListChanged(
   // talk_base::Network uses these prefix_length to compare network
   // interfaces discovered.
   std::vector<talk_base::Network*> networks;
+  int ipv4_interfaces = 0;
+  int ipv6_interfaces = 0;
   for (net::NetworkInterfaceList::const_iterator it = list.begin();
        it != list.end(); it++) {
     if (it->address.size() == net::kIPv4AddressSize) {
@@ -86,6 +89,7 @@ void IpcNetworkManager::OnNetworkListChanged(
           ConvertConnectionTypeToAdapterType(it->type));
       network->AddIP(talk_base::IPAddress(address));
       networks.push_back(network);
+      ++ipv4_interfaces;
     } else if (it->address.size() == net::kIPv6AddressSize) {
       in6_addr address;
       memcpy(&address, &it->address[0], sizeof(in6_addr));
@@ -96,10 +100,21 @@ void IpcNetworkManager::OnNetworkListChanged(
             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);
+  }
+
   if (CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kAllowLoopbackInPeerConnection)) {
     std::string name_v4("loopback_ipv4");