Cast channel logging: log additional statistics.

extensions/browser/api/cast_channel/logger.h

Index: extensions/browser/api/cast_channel/logger.h
diff --git a/extensions/browser/api/cast_channel/logger.h b/extensions/browser/api/cast_channel/logger.h
index fc301ca7f3f5b45d282f926995b271be64128213..7806c21cfa43bcf25d2017d800fa78d378ddcb72 100644
--- a/extensions/browser/api/cast_channel/logger.h
+++ b/extensions/browser/api/cast_channel/logger.h
@@ -116,10 +116,8 @@ class Logger : public base::RefCounted<Logger> {
   AggregatedSocketEventLogMap aggregated_socket_events_;
   base::TimeTicks unix_epoch_time_ticks_;
 
-  // Number of socket / event entries evicted by the logger due to size
-  // constraints.
-  int num_evicted_aggregated_socket_events_;
-  int num_evicted_socket_events_;
+  // Log proto holding global statistics.
+  proto::Log log_;
 
   base::ThreadChecker thread_checker_;