1 files changed, 69 insertions, 0 deletions
diff --git a/chromium/chrome/browser/net/prediction_options.cc b/chromium/chrome/browser/net/prediction_options.cc
new file mode 100644
index 00000000000..493fb0792bc
--- /dev/null
+++ b/chromium/chrome/browser/net/prediction_options.cc
@@ -0,0 +1,69 @@
+// Copyright 2014 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.
+
+#include "chrome/browser/net/prediction_options.h"
+
+#include "base/logging.h"
+#include "chrome/common/chrome_features.h"
+#include "chrome/common/pref_names.h"
+#include "components/pref_registry/pref_registry_syncable.h"
+#include "components/prefs/pref_service.h"
+#include "content/public/browser/browser_thread.h"
+#include "net/base/network_change_notifier.h"
+
+namespace chrome_browser_net {
+
+namespace {
+
+// Since looking up preferences and current network connection are presumably
+// both cheap, we do not cache them here.
+NetworkPredictionStatus CanPrefetchAndPrerender(
+    int network_prediction_options) {
+  switch (network_prediction_options) {
+    case NETWORK_PREDICTION_ALWAYS:
+    case NETWORK_PREDICTION_WIFI_ONLY:
+      if (base::FeatureList::IsEnabled(
+              features::kPredictivePrefetchingAllowedOnAllConnectionTypes) ||
+          !net::NetworkChangeNotifier::IsConnectionCellular(
+              net::NetworkChangeNotifier::GetConnectionType())) {
+        return NetworkPredictionStatus::ENABLED;
+      }
+      return NetworkPredictionStatus::DISABLED_DUE_TO_NETWORK;
+    default:
+      DCHECK_EQ(NETWORK_PREDICTION_NEVER, network_prediction_options);
+      return NetworkPredictionStatus::DISABLED_ALWAYS;
+  }
+}
+
+bool CanPreresolveAndPreconnect(int network_prediction_options) {
+  // DNS preresolution and TCP preconnect are performed even on cellular
+  // networks if the user setting is WIFI_ONLY.
+  return network_prediction_options != NETWORK_PREDICTION_NEVER;
+}
+
+}  // namespace
+
+void RegisterPredictionOptionsProfilePrefs(
+    user_prefs::PrefRegistrySyncable* registry) {
+  registry->RegisterIntegerPref(
+      prefs::kNetworkPredictionOptions,
+      NETWORK_PREDICTION_DEFAULT,
+      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
+}
+
+NetworkPredictionStatus CanPrefetchAndPrerenderUI(PrefService* prefs) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  DCHECK(prefs);
+  return CanPrefetchAndPrerender(
+      prefs->GetInteger(prefs::kNetworkPredictionOptions));
+}
+
+bool CanPreresolveAndPreconnectUI(PrefService* prefs) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  DCHECK(prefs);
+  return CanPreresolveAndPreconnect(
+      prefs->GetInteger(prefs::kNetworkPredictionOptions));
+}
+
+}  // namespace chrome_browser_net