Add AllowNetworkPrediction preference name and enum.

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 3234e17c71d3c02cdb167d2e08d8b84ae015951e..3a747d8251796b5fc987511dcba1b9fbda645c7c 100644
--- a/chrome/browser/net/predictor.h
+++ b/chrome/browser/net/predictor.h
@@ -80,6 +80,15 @@ class PredictorObserver {
 // the IO thread.
 class Predictor {
  public:
+  // 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
+  };
+
   // A version number for prefs that are saved. This should be incremented when
   // we change the format so that we discard old data.
   static const int kPredictorReferrerVersion;