New extension API: "tab.socketAddress"

net/http/http_response_info.h

Index: net/http/http_response_info.h
===================================================================
--- net/http/http_response_info.h	(revision 71766)
+++ net/http/http_response_info.h	(working copy)
@@ -60,6 +60,10 @@
   // transparent proxy may have been involved.
   bool was_fetched_via_proxy;
 
+  // Remote address of the socket which fetched this resource, for presenting
+  // to inquisitive users.  Can be "ipv4:port", "[ipv6]:port", or empty.
+  std::string socket_address;
+
   // The time at which the request was made that resulted in this response.
   // For cached responses, this is the last time the cache entry was validated.
   base::Time request_time;