Allow SpdySessionPool to find/create SpdySession with IP pooling disabled.

net/spdy/spdy_session_pool.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_SPDY_SPDY_SESSION_POOL_H_
 #define NET_SPDY_SPDY_SESSION_POOL_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 69 matching lines @@
   //
   // Returns the new SpdySession. Note that the SpdySession begins reading from
   // |connection| on a subsequent event loop iteration, so it may be closed
   // immediately afterwards if the first read of |connection| fails.
   base::WeakPtr<SpdySession> CreateAvailableSessionFromSocket(
       const SpdySessionKey& key,
       std::unique_ptr<ClientSocketHandle> connection,
       const NetLogWithSource& net_log,
       bool is_secure);
 
-  // Return an available session for |key| that has an unclaimed push stream for
-  // |url| if such exists and |url| is not empty, or else an available session
-  // for |key| if such exists, or else nullptr.
+  // If |url| is not empty and there is a session for |key| that has an
+  // unclaimed push stream for |url|, return it.
+  // Otherwise if there is an available session for |key|, return it.
+  // Otherwise if there is a session to pool to based on IP address:
+  //   * if |enable_ip_based_pooling == true|,
+  //     then mark it as available for |key| and return it;
+  //   * if |enable_ip_based_pooling == false|,
+  //     then remove it from the available sessions, and return nullptr.
+  // Otherwise return nullptr.
   base::WeakPtr<SpdySession> FindAvailableSession(
       const SpdySessionKey& key,
       const GURL& url,
+      bool enable_ip_based_pooling,
       const NetLogWithSource& net_log);
 
   // Remove all mappings and aliases for the given session, which must
   // still be available. Except for in tests, this must be called by
   // the given session itself.
   void MakeSessionUnavailable(
       const base::WeakPtr<SpdySession>& available_session);
 
   // Removes an unavailable session from the pool.  Except for in
   // tests, this must be called by the given session itself.
@@ skipping 140 matching lines @@
   // resources from origins that are different from those of their associated
   // streams. May be nullptr.
   ProxyDelegate* proxy_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(SpdySessionPool);
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_SESSION_POOL_H_