Keep config events in RtcEventLog even if they are old.

webrtc/video/rtc_event_log.h

Index: webrtc/video/rtc_event_log.h
diff --git a/webrtc/video/rtc_event_log.h b/webrtc/video/rtc_event_log.h
index a6bf2e3d8836d2b7e0ee6f0ca702f56ffc48c366..5cf0a326d6f14881881ff608dcab1c7a66118e62 100644
--- a/webrtc/video/rtc_event_log.h
+++ b/webrtc/video/rtc_event_log.h
@@ -38,6 +38,10 @@ class RtcEventLog {
 
   static rtc::scoped_ptr<RtcEventLog> Create();
 
+  // Sets the time that events are stored in the internal event buffer
+  // before the user calls StartLogging.  The default is 10'000'000 us = 10 s

[hlundin-webrtc, 2015/08/28 11:16:29]

While C++14 allows apostrophe as "thousands separator", we tend to write large
numbers in comments using either , as separator, or no separator at all.

[terelius, 2015/09/17 12:44:08]

Though using comma as a separator does not follow any C++ standard. Would space
be an acceptable substitute?

[hlundin-webrtc, 2015/09/22 09:35:15]

Acknowledged.

+  virtual void SetBufferDuration(int64_t recent_log_duration_us) = 0;
+
   // Starts logging for the specified duration to the specified file.
   // The logging will stop automatically after the specified duration.
   // If the file already exists it will be overwritten.