Add periodic logging of video stats.

webrtc/call/call.cc

Index: webrtc/call/call.cc
diff --git a/webrtc/call/call.cc b/webrtc/call/call.cc
index c85eaf6990b8ceb1a8a9a0f17fe6ca8b19064c68..0c082df0ec57e00ae632cda2f3622c2fd42cb096 100644
--- a/webrtc/call/call.cc
+++ b/webrtc/call/call.cc
@@ -201,6 +201,18 @@ class Call : public webrtc::Call,
 };
 }  // namespace internal
 
+std::string Call::Stats::ToString(int64_t time_ms) const {
+  std::stringstream ss;
+  ss << "Call stats:" << time_ms << ",{";
+  ss << "[send_bw_bps:" << send_bandwidth_bps << "],";

[pbos-webrtc, 2016/07/10 16:58:50]

Pref. removing []s because they look like arrays of values, and not key-values.

[åsapersson, 2016/08/01 15:55:22]

Done.

+  ss << "[recv_bw_bps:" << recv_bandwidth_bps << "],";
+  ss << "[max_pad_bps:" << max_padding_bitrate_bps << "],";
+  ss << "[pacer_delay_ms:" << pacer_delay_ms << "],";
+  ss << "[rtt_ms:" << rtt_ms << "]";
+  ss << '}';
+  return ss.str();
+}
+
 Call* Call::Create(const Call::Config& config) {
   return new internal::Call(config);
 }