Add Socket::ReadIfReady()

net/socket/ssl_client_socket_impl.h

Index: net/socket/ssl_client_socket_impl.h
diff --git a/net/socket/ssl_client_socket_impl.h b/net/socket/ssl_client_socket_impl.h
index 86505ab2f4a80c3d8620bf3684b999603bf1bcf8..1450e166a36a27e1f78ca52c60ca16a0aed3d9e2 100644
--- a/net/socket/ssl_client_socket_impl.h
+++ b/net/socket/ssl_client_socket_impl.h
@@ -127,6 +127,9 @@ class SSLClientSocketImpl : public SSLClientSocket,
   int Read(IOBuffer* buf,
            int buf_len,
            const CompletionCallback& callback) override;
+  int ReadIfReady(IOBuffer* buf,
+                  int buf_len,
+                  const CompletionCallback& callback) override;
   int Write(IOBuffer* buf,
             int buf_len,
             const CompletionCallback& callback) override;
@@ -159,7 +162,7 @@ class SSLClientSocketImpl : public SSLClientSocket,
   void OnHandshakeIOComplete(int result);
 
   int DoHandshakeLoop(int last_io_result);
-  int DoPayloadRead();
+  int DoPayloadRead(IOBuffer* buf, int buf_len);

[Bence, 2017/03/03 16:33:41]

Optional: add a comment about whether this method saves a reference to |buf|. 
(Optional because my understanding is that private methods are not part of the
public API therefore it is not required to document them as rigorously.)

[xunjieli, 2017/03/03 19:41:06]

Acknowledged.

   int DoPayloadWrite();
 
   // Called when an asynchronous event completes which may have blocked the