Add AllowNetworkPrediction preference name and enum.

chrome/browser/net/predictor.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.
 
 // A Predictor object is instantiated once in the browser process, and manages
 // both preresolution of hostnames, as well as TCP/IP preconnection to expected
 // subresources.
 // Most hostname lists are provided by the renderer processes, and include URLs
 // that *might* be used in the near future by the browsing user.  One goal of
 // this class is to cause the underlying DNS structure to lookup a hostname
@@ skipping 95 matching lines @@
   // avoidance will kick in and all speculations in the queue will be discarded.
   static const int kMaxSpeculativeResolveQueueDelayMs;
 
   // We don't bother learning to preconnect via a GET if the original URL
   // navigation was so long ago, that a preconnection would have been dropped
   // anyway.  We believe most servers will drop the connection in 10 seconds, so
   // we currently estimate this time-till-drop at 10 seconds.
   // TODO(jar): We should do a persistent field trial to validate/optimize this.
   static const int kMaxUnusedSocketLifetimeSecondsWithoutAGet;
 
+  // Enum describing when to allow network predictions based on connection type.
+  // The same enum must be used by the platform-dependent components.
+  // TODO(bnc): implement as per crbug.com/334602.
+  enum NetworkPredictionOptions {
+    NETWORK_PREDICTION_ALWAYS,
+    NETWORK_PREDICTION_WIFI_ONLY,
+    NETWORK_PREDICTION_NEVER
+  };

[mmenke, 2014/06/20 14:48:28]

nit:  Looks like enums go before constants, according to the style guide.

[Bence, 2014/06/20 15:13:55]

Done.

+
   // |max_concurrent| specifies how many concurrent (parallel) prefetches will
   // be performed. Host lookups will be issued through |host_resolver|.
   explicit Predictor(bool preconnect_enabled);
 
   virtual ~Predictor();
 
   // This function is used to create a predictor. For testing, we can create
   // a version which does a simpler shutdown.
   static Predictor* CreatePredictor(bool preconnect_enabled,
                                     bool simple_shutdown);
@@ skipping 479 matching lines @@
       PrefService* user_prefs,
       PrefService* local_state,
       IOThread* io_thread,
       net::URLRequestContextGetter* getter) OVERRIDE;
   virtual void ShutdownOnUIThread() OVERRIDE;
 };
 
 }  // namespace chrome_browser_net
 
 #endif  // CHROME_BROWSER_NET_PREDICTOR_H_