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diff --git a/content/browser/geolocation/wifi_data.h b/content/browser/geolocation/wifi_data.h
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+++ b/content/browser/geolocation/wifi_data.h
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+// Copyright 2013 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.
+
+#ifndef CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_H_
+#define CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_H_
+
+#include <set>
+
+#include "base/basictypes.h"
+#include "base/strings/string16.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+// Wifi data relating to a single access point.
+struct CONTENT_EXPORT AccessPointData {
+  AccessPointData();
+  ~AccessPointData();
+
+  // MAC address, formatted as per MacAddressAsString16.
+  string16 mac_address;
+  int radio_signal_strength;  // Measured in dBm
+  int channel;
+  int signal_to_noise;  // Ratio in dB
+  string16 ssid;   // Network identifier
+};
+
+// This is to allow AccessPointData to be used in std::set. We order
+// lexicographically by MAC address.
+struct AccessPointDataLess {
+  bool operator()(const AccessPointData& data1,
+                  const AccessPointData& data2) const {
+    return data1.mac_address < data2.mac_address;
+  }
+};
+
+// All data for wifi.
+struct CONTENT_EXPORT WifiData {
+  WifiData();
+  ~WifiData();
+
+  // Determines whether a new set of WiFi data differs significantly from this.
+  bool DiffersSignificantly(const WifiData& other) const;
+
+  // Store access points as a set, sorted by MAC address. This allows quick
+  // comparison of sets for detecting changes and for caching.
+  typedef std::set<AccessPointData, AccessPointDataLess> AccessPointDataSet;
+  AccessPointDataSet access_point_data;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_H_