Gate WebRTC remote-bound event logging behind a Chrome Feature

Previously, it was gated behind a command line switch.
Now, we gate behind a feature, to allow rolling out the feature
via Chrome Variations.

Bug: 775415
Change-Id: Ie99ad085ae87e56e5e9e80b69611be0832e584f6
Reviewed-on: https://chromium-review.googlesource.com/1107800
Reviewed-by: Henrik Grunell <[email protected]>
Reviewed-by: Guido Urdaneta <[email protected]>
Commit-Queue: Elad Alon <[email protected]>
Cr-Commit-Position: refs/heads/master@{#570365}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 5999f63..795a949 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -1179,6 +1179,9 @@
 extern const char kWebrtcNewEncodeCpuLoadEstimatorName[];
 extern const char kWebrtcNewEncodeCpuLoadEstimatorDescription[];
 
+extern const char kWebRtcRemoteEventLogName[];
+extern const char kWebRtcRemoteEventLogDescription[];
+
 extern const char kWebrtcSrtpAesGcmName[];
 extern const char kWebrtcSrtpAesGcmDescription[];