Enable BWE logging to command line when rtc_enable_bwe_test_logging is set to true

webrtc/modules/remote_bitrate_estimator/test/bwe_test_logging.cc

Index: webrtc/modules/remote_bitrate_estimator/test/bwe_test_logging.cc
diff --git a/webrtc/modules/remote_bitrate_estimator/test/bwe_test_logging.cc b/webrtc/modules/remote_bitrate_estimator/test/bwe_test_logging.cc
index 3a84e81a0b973c24425f84264729be4050dfbbd2..43818b08ca504cc090b11768116b79c3faed9666 100644
--- a/webrtc/modules/remote_bitrate_estimator/test/bwe_test_logging.cc
+++ b/webrtc/modules/remote_bitrate_estimator/test/bwe_test_logging.cc
@@ -91,15 +91,28 @@ void Logging::Log(const char format[], ...) {
 }
 
 void Logging::Plot(int figure, double value) {
-  Plot(figure, value, "-");
+  Plot(figure, value, 0, "-");
+}
+
+void Logging::Plot(int figure, double value, uint32_t ssrc) {
+  Plot(figure, value, ssrc, "-");
 }
 
 void Logging::Plot(int figure, double value, const std::string& alg_name) {
+  Plot(figure, value, 0, alg_name);
+}
+
+void Logging::Plot(int figure,
+                   double value,
+                   uint32_t ssrc,
+                   const std::string& alg_name) {
   CriticalSectionScoped cs(crit_sect_.get());
   ThreadMap::iterator it = thread_map_.find(rtc::CurrentThreadId());
   assert(it != thread_map_.end());
   const State& state = it->second.stack.top();
-  std::string label = state.tag + '@' + alg_name;
+  std::stringstream ss;
+  ss << ssrc;
+  std::string label = state.tag + ':' + ss.str() + '@' + alg_name;
   std::string prefix("Available");
   if (alg_name.compare(0, prefix.length(), prefix) == 0) {
     std::string receiver("Receiver");