Provide a way to specify in Finch trials to disable prerender local

chrome/browser/prerender/prerender_field_trial.h

Index: chrome/browser/prerender/prerender_field_trial.h
diff --git a/chrome/browser/prerender/prerender_field_trial.h b/chrome/browser/prerender/prerender_field_trial.h
index e4a1a285367554f936b166ee1229843f5786d3e2..c7c32105793382041b45edfa0b51cd58d4da92a6 100644
--- a/chrome/browser/prerender/prerender_field_trial.h
+++ b/chrome/browser/prerender/prerender_field_trial.h
@@ -32,7 +32,11 @@ bool IsLocalPredictorEnabled();
 
 // Indicates whether to disable the local predictor due to unencrypted sync
 // settings and configuration.
-bool DisableLocalPredictorBasedOnSyncAndConfiguration(Profile* profile);
+bool ShouldDisableLocalPredictorBasedOnSyncAndConfiguration(Profile* profile);
+
+// Returns whether or not the local predictor is temporarily disabled, due
+// to network predictive action settings and current network.
+bool ShouldDisableLocalPredictorDueToPreferencesAndNetwork(Profile* profile);
 
 // Returns true iff the LoggedIn Predictor is enabled.
 bool IsLoggedInPredictorEnabled();