Create alternative service field trial group.

chrome/browser/io_thread.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 CHROME_BROWSER_IO_THREAD_H_
 #define CHROME_BROWSER_IO_THREAD_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 360 matching lines @@
       const VariationParameters& quic_trial_params);
 
   // Returns true if QUIC shouldn't load QUIC server information from the disk
   // cache.
   static bool ShouldQuicDisableDiskCache(
       const VariationParameters& quic_trial_params);
 
   // Returns true if QUIC should prefer AES-GCN even without hardware support.
   static bool ShouldQuicPreferAes(const VariationParameters& quic_trial_params);
 
+  // Returns true if QUIC should enable alternative services.
+  static bool ShouldQuicEnableAlternativeServices(
+      const VariationParameters& quic_trial_params);
+
   // Returns the maximum number of QUIC connections with high packet loss in a
   // row after which QUIC should be disabled.  Returns 0 if the default value
   // should be used.
   static int GetQuicMaxNumberOfLossyConnections(
       const VariationParameters& quic_trial_params);
 
   // Returns the packet loss rate in fraction after which a QUIC connection is
   // closed and is considered as a lossy connection. Returns 0 if the default
   // value should be used.
   static float GetQuicPacketLossThreshold(
@@ skipping 103 matching lines @@
   bool is_quic_allowed_by_policy_;
 
   const base::TimeTicks creation_time_;
 
   base::WeakPtrFactory<IOThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IOThread);
 };
 
 #endif  // CHROME_BROWSER_IO_THREAD_H_