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+// Copyright (c) 2011 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.
+
+// Defines the Geolocation access token store, and associated factory function.
+// An access token store is responsible for providing the API to persist
+// access tokens, one at a time, and to load them back on mass.
+// The API is a little more complex than one might wish, due to the need for
+// prefs access to happen asynchronously on the UI thread.
+// This API is provided as abstract base classes to allow mocking and testing
+// of clients, without dependency on browser process singleton objects etc.
+
+#ifndef CONTENT_PUBLIC_BROWSER_ACCESS_TOKEN_STORE_H_
+#define CONTENT_PUBLIC_BROWSER_ACCESS_TOKEN_STORE_H_
+#pragma once
+
+#include <map>
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "base/string16.h"
+#include "content/common/content_export.h"
+#include "googleurl/src/gurl.h"
+
+class GURL;
+
+namespace net {
+class URLRequestContextGetter;
+}
+
+namespace content {
+
+// Provides storage for the access token used in the network request.
+class AccessTokenStore : public base::RefCountedThreadSafe<AccessTokenStore> {
+ public:
+  // Map of server URLs to associated access token.
+  typedef std::map<GURL, string16> AccessTokenSet;
+  typedef base::Callback<void(AccessTokenSet, net::URLRequestContextGetter*)>
+      LoadAccessTokensCallbackType;
+
+  // |callback| will be invoked once per LoadAccessTokens call, after existing
+  // access tokens have been loaded from persistent store. As a convenience the
+  // URLRequestContextGetter is also supplied as an argument in |callback|, as
+  // in Chrome the call to obtain this must also be performed on the UI thread
+  // so it is efficient to piggyback it onto this request.
+  // Takes ownership of |callback|.
+  CONTENT_EXPORT virtual void LoadAccessTokens(
+      const LoadAccessTokensCallbackType& callback) = 0;
+
+  virtual void SaveAccessToken(
+      const GURL& server_url, const string16& access_token) = 0;
+
+ protected:
+  friend class base::RefCountedThreadSafe<AccessTokenStore>;
+  CONTENT_EXPORT AccessTokenStore();
+  CONTENT_EXPORT virtual ~AccessTokenStore();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AccessTokenStore);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_ACCESS_TOKEN_STORE_H_