net: split the SSL session cache between incognito and normal.

net/socket/ssl_client_socket_openssl.h

Index: net/socket/ssl_client_socket_openssl.h
diff --git a/net/socket/ssl_client_socket_openssl.h b/net/socket/ssl_client_socket_openssl.h
index a15c0e3b9684502d090ee0de3fa7d1dbd5684b99..1cd69b325bea1adc5a71df30b2f8e323ea14d17d 100644
--- a/net/socket/ssl_client_socket_openssl.h
+++ b/net/socket/ssl_client_socket_openssl.h
@@ -43,6 +43,9 @@ class SSLClientSocketOpenSSL : public SSLClientSocket {
   ~SSLClientSocketOpenSSL();
 
   const HostPortPair& host_and_port() const { return host_and_port_; }
+  const std::string& session_cache_shard() const {
+    return session_cache_shard_;
+  }
 
   // Callback from the SSL layer that indicates the remote server is requesting
   // a certificate for this client.
@@ -156,6 +159,10 @@ class SSLClientSocketOpenSSL : public SSLClientSocket {
   scoped_ptr<ClientSocketHandle> transport_;
   const HostPortPair host_and_port_;
   SSLConfig ssl_config_;
+  // session_cache_shard_ is an opaque string that partitions the SSL session
+  // cache. i.e. sessions created with one value will not attempt to resume on
+  // the socket with a different value.
+  const std::string session_cache_shard_;
 
   // Used for session cache diagnostics.
   bool trying_cached_session_;