Implement prediction_options.

chrome/browser/net/predictor.h

Index: chrome/browser/net/predictor.h
diff --git a/chrome/browser/net/predictor.h b/chrome/browser/net/predictor.h
index 3a747d8251796b5fc987511dcba1b9fbda645c7c..76ea6d451907ae3fa5658dba117cb6aa31932c2a 100644
--- a/chrome/browser/net/predictor.h
+++ b/chrome/browser/net/predictor.h
@@ -83,10 +83,13 @@ class Predictor {
   // Enum describing when to allow network predictions based on connection type.
   // The same enum must be used by the platform-dependent components.

[mmenke, 2014/06/26 20:41:02]

Should mention that order matters here, since they're stored in the prefs file.

[Bence, 2014/06/27 15:11:51]

Done.

   // TODO(bnc): implement as per crbug.com/334602.
+  // NETWORK_PREDICTION_UNSET means that the old preferences,
+  // kNetworkPredictionEnabled and kAllowPrerender, should be observed.
   enum NetworkPredictionOptions {
     NETWORK_PREDICTION_ALWAYS,
     NETWORK_PREDICTION_WIFI_ONLY,
-    NETWORK_PREDICTION_NEVER
+    NETWORK_PREDICTION_NEVER,
+    NETWORK_PREDICTION_UNSET,
   };

[mmenke, 2014/06/26 20:41:02]

Suggest moving these into the new file, since they're going to be used outside
the predictor as well.

[Bence, 2014/06/27 15:11:50]

Cf. https://codereview.chromium.org/336543003#msg2.

[Bence, 2014/06/27 18:26:45]

Done.

 
   // A version number for prefs that are saved. This should be incremented when