Added unit test for DevTools' ephemeral port support.

net/socket/stream_listen_socket.h

Index: net/socket/stream_listen_socket.h
diff --git a/net/socket/stream_listen_socket.h b/net/socket/stream_listen_socket.h
index 90b54500ace17f2f28631f3fa8449e644564f298..0757520f4049224b34b563e2f4449e28b5bea674 100644
--- a/net/socket/stream_listen_socket.h
+++ b/net/socket/stream_listen_socket.h
@@ -100,6 +100,9 @@ class NET_EXPORT StreamListenSocket
   void WatchSocket(WaitState state);
   void UnwatchSocket();
 
+  // For testing use only!
+  virtual int GetLocalAddressImpl(IPEndPoint* address);

[wtc, 2014/06/10 17:46:44]

Nit: please document how GetLocalAddressImpl differs from GetLocalAddress. They
have exactly the same prototype.

Update: after reading the entire CL, I now understand how you intend
GetLocalAddressImpl to be used. Why don't you just declare GetPeerAddress as a
virtual method?

[wtc, 2014/06/10 17:48:28]

Just to clarify: if you keep GetLocalAddressImpl, please document how it is
intended to be used, because the only way for a reader to figure that out now is
to read content/browser/devtools/devtools_http_handler_unittest.cc, which is
outside the net/ directory.

[Ken Russell (switch to Gerrit), 2014/06/10 18:57:07]

Thanks for the suggestion. That's fine with me, and simpler. Made both
GetLocalAddress and GetPeerAddress virtual, and documented them as virtual for
unit test purposes.

+
   Delegate* const socket_delegate_;
 
  private: