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diff --git a/Source/WebCore/page/GeolocationPositionCache.h b/Source/WebCore/page/GeolocationPositionCache.h
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+/*
+ * Copyright 2010, The Android Open Source Project
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef GeolocationPositionCache_h
+#define GeolocationPositionCache_h
+
+#include "PlatformString.h"
+#include "ScriptExecutionContext.h"
+
+#include <wtf/Forward.h>
+#include <wtf/MessageQueue.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+
+class Geoposition;
+
+// Maintains a cached position for Geolocation. Takes care of writing and
+// reading the position to a database on a background thread. The Geolocation
+// spec does not require a cached position to be maintained, so we take a
+// best-effort approach where we do not wait for database reads or writes.
+class GeolocationPositionCache {
+public:
+    static GeolocationPositionCache* instance();
+
+    void addUser();
+    void removeUser();
+
+    void setDatabasePath(const String&);
+    void setCachedPosition(Geoposition*);
+    Geoposition* cachedPosition();
+
+private:
+    GeolocationPositionCache();
+
+    void startBackgroundThread();
+    static void* threadEntryPoint(void* object);
+    void threadEntryPointImpl();
+
+    void triggerReadFromDatabase();
+    static void readFromDatabase(ScriptExecutionContext*, GeolocationPositionCache*);
+    void readFromDatabaseImpl();
+    void triggerWriteToDatabase();
+    static void writeToDatabase(ScriptExecutionContext*, GeolocationPositionCache*);
+    void writeToDatabaseImpl();
+
+    RefPtr<Geoposition> m_cachedPosition;
+    Mutex m_cachedPositionMutex;
+    ThreadIdentifier m_threadId;
+    MessageQueue<ScriptExecutionContext::Task> m_queue;
+    String m_databaseFile;
+    Mutex m_databaseFileMutex;
+};
+
+} // namespace WebCore
+
+#endif // GeolocationPositionCache_h