Extend the webRequest.onCompleted event details object with TLS/SSL information

extensions/common/switches.cc

Index: extensions/common/switches.cc
diff --git a/extensions/common/switches.cc b/extensions/common/switches.cc
index 399e9fb72a3bcefd8ffa31e72a6cf67a100b618c..6f487fc83da74847f0215ec48f997cb2e3b3c0cb 100644
--- a/extensions/common/switches.cc
+++ b/extensions/common/switches.cc
@@ -117,6 +117,10 @@ const char kTraceAppSource[] = "enable-trace-app-source";
 // the one received from update manifest.
 const char kEnableCrxHashCheck[] = "enable-crx-hash-check";
 
+// Enable adding SSL/TLS information to the webrequest.onCompleted details
+// object if underlying transport supports it.
+const char kWebrequestSSLInfo[] = "webrequest-ssl-info";
+
 }  // namespace switches
 
 }  // namespace extensions