Add more logging around FilteringNetworkManager and IpcNetworkManager.

There's an infrequently-occurring issue where webrtc never receives a
network update from FilteringNetworkManager, but it's not clear whether
the issue is related to FilteringNetworkManager interacting with the
permission service, or IpcNetworkManager underneath getting the actual
network list.

So, this CL adds some logging to FilteringNetworkManager and
IpcNetworkManager that will help pinpoint the cause, next time someone
is able to reproduce the issue and provide a log.

Bug: chromium:699973
Change-Id: I5eecf668c89963dd31ef66fc29687fe91dd2ac49
Reviewed-on: https://chromium-review.googlesource.com/587509Reviewed-by: Henrik Boström <hbos@chromium.org>
Commit-Queue: Taylor Brandstetter <deadbeef@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491173}

content/renderer/p2p/filtering_network_manager.cc

@@ -98,6 +98,7 @@ void FilteringNetworkManager::CheckPermission() {
   started_permission_check_ = true;
   pending_permission_checks_ = 2;
 
+  VLOG(1) << "FilteringNetworkManager checking permission status.";
   // Request for media permission asynchronously.
   media_permission_->HasPermission(
       media::MediaPermission::AUDIO_CAPTURE, requesting_origin_,
@@ -110,7 +111,8 @@ void FilteringNetworkManager::CheckPermission() {
 void FilteringNetworkManager::OnPermissionStatus(bool granted) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK_GT(pending_permission_checks_, 0);
-  VLOG(3) << "OnPermissionStatus: " << granted;
+  VLOG(1) << "FilteringNetworkManager received permission status: "
+          << (granted ? "granted" : "denied");
   IPPermissionStatus old_status = GetIPPermissionStatus();
 
   --pending_permission_checks_;

content/renderer/p2p/ipc_network_manager.cc

@@ -62,6 +62,9 @@ void IpcNetworkManager::StartUpdating() {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::Bind(&IpcNetworkManager::SendNetworksChangedSignal,
                               weak_factory_.GetWeakPtr()));
+  } else {
+    VLOG(1) << "IpcNetworkManager::StartUpdating called; still waiting for "
+               "network list from browser process.";
   }
   ++start_count_;
 }
@@ -76,8 +79,11 @@ void IpcNetworkManager::OnNetworkListChanged(
     const net::IPAddress& default_ipv4_local_address,
     const net::IPAddress& default_ipv6_local_address) {
   // Update flag if network list received for the first time.
-  if (!network_list_received_)
+  if (!network_list_received_) {
+    VLOG(1) << "IpcNetworkManager received network list from browser process "
+               "for the first time.";
     network_list_received_ = true;
+  }
 
   // Default addresses should be set only when they are in the filtered list of
   // network addresses.