[CrOS PhoneHub] Add a few Nearby-related debug logs

Will be useful while debugging Nearby Connections issues

Bug: 1106937
Change-Id: I07c65eea9a9da1ef3c5d6a300219ee80ece9d622
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523906
Auto-Submit: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825196}

chrome/browser/chromeos/secure_channel/nearby_connector_impl.cc

@@ -129,6 +129,9 @@ void NearbyConnectorImpl::ProcessQueuedConnectionRequests() {
 }
 
 void NearbyConnectorImpl::OnNearbyProcessStopped() {
+  PA_LOG(WARNING) << "Nearby process stopped unexpectedly. Destroying active "
+                  << "connections.";
+
   ClearActiveAndPendingConnections();
   ProcessQueuedConnectionRequests();
 }

chrome/browser/chromeos/secure_channel/nearby_endpoint_finder_impl.cc

@@ -75,6 +75,8 @@ void NearbyEndpointFinderImpl::PerformFindEndpoint() {
 
 void NearbyEndpointFinderImpl::OnEndpointFound(const std::string& endpoint_id,
                                                DiscoveredEndpointInfoPtr info) {
+  PA_LOG(VERBOSE) << "Found endpoint with ID " << endpoint_id
+                  << ", stopping discovery";
   nearby_connections_->StopDiscovery(
       mojom::kServiceId,
       base::BindOnce(&NearbyEndpointFinderImpl::OnStopDiscoveryResult,