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diff --git a/chrome/common/geoposition.h b/chrome/common/geoposition.h
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+++ b/chrome/common/geoposition.h
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+// Copyright (c) 2010 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.
+
+// This file declares the Position structure, which is used to represent a
+// position fix. Originally derived from
+// http://gears.googlecode.com/svn/trunk/gears/geolocation/geolocation.h
+
+#ifndef CHROME_COMMON_GEOPOSITION_H_
+#define CHROME_COMMON_GEOPOSITION_H_
+
+#include "base/string16.h"
+
+// The internal representation of a geo position. Some properties use different
+// types when passed to JavaScript.
+struct Geoposition {
+ public:
+  // Error codes for returning to JavaScript. These values are defined by the
+  // W3C spec. Note that Gears does not use all of these codes, but we need
+  // values for all of them to allow us to provide the constants on the error
+  // object.
+  enum ErrorCode {
+    ERROR_CODE_NONE = 0,               // Chrome addition
+    ERROR_CODE_PERMISSION_DENIED = 1,
+    ERROR_CODE_POSITION_UNAVAILABLE = 2,
+    ERROR_CODE_TIMEOUT = 3,
+  };
+
+  Geoposition();
+
+  bool is_valid_latlong() const;
+  bool is_valid_altitude() const;
+  bool is_valid_accuracy() const;
+  bool is_valid_altitude_accuracy() const;
+  bool is_valid_heading() const;
+  bool is_valid_speed() const;
+  bool is_valid_timestamp() const;
+
+  // A valid fix has a valid latitude, longitude, accuracy and timestamp.
+  bool IsValidFix() const;
+
+  // A position is considered initialized if it has either a valid fix or
+  // an error code other than NONE.
+  bool IsInitialized() const;
+
+  // These properties correspond to the JavaScript Position object.
+  double latitude;           // In degrees
+  double longitude;          // In degrees
+  double altitude;           // In metres
+  double accuracy;           // In metres
+  double altitude_accuracy;  // In metres
+  double heading;            // In degrees clockwise relative to the true north
+  double speed;              // In meters per second
+  int64 timestamp;           // Milliseconds since 1st Jan 1970
+
+  // These properties are returned to JavaScript as a PositionError object.
+  ErrorCode error_code;
+  std::wstring error_message;  // Human-readable error message
+};
+
+#endif  // CHROME_COMMON_GEOPOSITION_H_