Start and stop RTC event logs from private extension API.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 014731559badacda22307328e48ce6064b88843e..2ddae0d7453449f8de14c7ae48b078aad3a273e0 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -501,6 +501,10 @@ const char kEnableQuic[]                    = "enable-quic";
 // This only has an effect if QUIC protocol is enabled.
 const char kEnableQuicPortSelection[]       = "enable-quic-port-selection";
 
+// If the WebRTC logging private API is active, enables RTC event logging.
+const char kEnableRtcEventLoggingFromExtension[] =
+    "enable-rtc-event-logging-from-extension";
+
 // Enables support for HTTP alternative services.
 const char kEnableAlternativeServices[] = "enable-alternative-services";