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 1545442b9c0589dc12d06a0b7c9000d7cb5cf819..36daa0bd6ca6f9df49eda618f56df9fb52405041 100644
--- a/extensions/common/switches.cc
+++ b/extensions/common/switches.cc
@@ -117,6 +117,10 @@ const char kNativeCrxBindings[] = "native-crx-bindings";
 // 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