Revert of Reland: Geolocation: move from content/browser to device/

content/browser/geolocation/network_location_provider.h

Index: content/browser/geolocation/network_location_provider.h
diff --git a/content/browser/geolocation/network_location_provider.h b/content/browser/geolocation/network_location_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..cef1ad161407d5d252fb886d7a4d65e8aeab8954
--- /dev/null
+++ b/content/browser/geolocation/network_location_provider.h
@@ -0,0 +1,146 @@
+// Copyright (c) 2012 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_NETWORK_LOCATION_PROVIDER_H_
+#define CONTENT_BROWSER_GEOLOCATION_NETWORK_LOCATION_PROVIDER_H_
+
+#include <stddef.h>
+
+#include <list>
+#include <map>
+#include <memory>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "base/strings/string16.h"
+#include "base/threading/non_thread_safe.h"
+#include "base/threading/thread.h"
+#include "content/browser/geolocation/location_provider_base.h"
+#include "content/browser/geolocation/network_location_request.h"
+#include "content/browser/geolocation/wifi_data_provider_manager.h"
+#include "content/common/content_export.h"
+#include "content/public/common/geoposition.h"
+
+namespace content {
+class AccessTokenStore;
+
+class NetworkLocationProvider : public base::NonThreadSafe,
+                                public LocationProviderBase {
+ public:
+  // Cache of recently resolved locations. Public for tests.
+  class CONTENT_EXPORT PositionCache {
+   public:
+    // The maximum size of the cache of positions.
+    static const size_t kMaximumSize;
+
+    PositionCache();
+    ~PositionCache();
+
+    // Caches the current position response for the current set of cell ID and
+    // WiFi data. In the case of the cache exceeding kMaximumSize this will
+    // evict old entries in FIFO orderer of being added.
+    // Returns true on success, false otherwise.
+    bool CachePosition(const WifiData& wifi_data,
+                       const Geoposition& position);
+
+    // Searches for a cached position response for the current set of data.
+    // Returns NULL if the position is not in the cache, or the cached
+    // position if available. Ownership remains with the cache.
+    const Geoposition* FindPosition(const WifiData& wifi_data);
+
+   private:
+    // Makes the key for the map of cached positions, using a set of
+    // data. Returns true if a good key was generated, false otherwise.
+    static bool MakeKey(const WifiData& wifi_data,
+                        base::string16* key);
+
+    // The cache of positions. This is stored as a map keyed on a string that
+    // represents a set of data, and a list to provide
+    // least-recently-added eviction.
+    typedef std::map<base::string16, Geoposition> CacheMap;
+    CacheMap cache_;
+    typedef std::list<CacheMap::iterator> CacheAgeList;
+    CacheAgeList cache_age_list_;  // Oldest first.
+  };
+
+  NetworkLocationProvider(
+      const scoped_refptr<AccessTokenStore>& access_token_store,
+      const scoped_refptr<net::URLRequestContextGetter>& context,
+      const GURL& url,
+      const base::string16& access_token);
+  ~NetworkLocationProvider() override;
+
+  // LocationProvider implementation
+  bool StartProvider(bool high_accuracy) override;
+  void StopProvider() override;
+  void GetPosition(Geoposition* position) override;
+  void RequestRefresh() override;
+  void OnPermissionGranted() override;
+
+ private:
+  // Satisfies a position request from cache or network.
+  void RequestPosition();
+
+  // Gets called when new wifi data is available.
+  void OnWifiDataUpdate();
+
+  // Internal helper used by OnWifiDataUpdate.
+  void OnWifiDataUpdated();
+
+  bool IsStarted() const;
+
+  void OnLocationResponse(const Geoposition& position,
+                          bool server_error,
+                          const base::string16& access_token,
+                          const WifiData& wifi_data);
+
+  const scoped_refptr<AccessTokenStore> access_token_store_;
+
+  // The wifi data provider, acquired via global factories.
+  WifiDataProviderManager* wifi_data_provider_manager_;
+
+  WifiDataProviderManager::WifiDataUpdateCallback wifi_data_update_callback_;
+
+  // The  wifi data and a flag to indicate if the data set is complete.
+  WifiData wifi_data_;
+  bool is_wifi_data_complete_;
+
+  // The timestamp for the latest wifi data update.
+  base::Time wifi_timestamp_;
+
+  // Cached value loaded from the token store or set by a previous server
+  // response, and sent in each subsequent network request.
+  base::string16 access_token_;
+
+  // The current best position estimate.
+  Geoposition position_;
+
+  // Whether permission has been granted for the provider to operate.
+  bool is_permission_granted_;
+
+  bool is_new_data_available_;
+
+  // The network location request object, and the url it uses.
+  std::unique_ptr<NetworkLocationRequest> request_;
+
+  // The cache of positions.
+  const std::unique_ptr<PositionCache> position_cache_;
+
+  base::WeakPtrFactory<NetworkLocationProvider> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(NetworkLocationProvider);
+};
+
+// Factory functions for the various types of location provider to abstract
+// over the platform-dependent implementations.
+CONTENT_EXPORT LocationProviderBase* NewNetworkLocationProvider(
+    const scoped_refptr<AccessTokenStore>& access_token_store,
+    const scoped_refptr<net::URLRequestContextGetter>& context,
+    const GURL& url,
+    const base::string16& access_token);
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_GEOLOCATION_NETWORK_LOCATION_PROVIDER_H_