Reland 2:Geolocation: move from content/browser to device/

content/browser/geolocation/wifi_data_provider_common.h

-// 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_WIFI_DATA_PROVIDER_COMMON_H_
-#define CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_PROVIDER_COMMON_H_
-
-#include <assert.h>
-#include <stdint.h>
-
-#include <memory>
-
-#include "base/logging.h"
-#include "base/macros.h"
-#include "base/memory/weak_ptr.h"
-#include "base/strings/string16.h"
-#include "content/browser/geolocation/wifi_data_provider.h"
-#include "content/browser/geolocation/wifi_polling_policy.h"
-#include "content/common/content_export.h"
-
-namespace content {
-
-// Converts a MAC address stored as an array of uint8_t to a string.
-base::string16 MacAddressAsString16(const uint8_t mac_as_int[6]);
-
-// Base class to promote code sharing between platform specific wifi data
-// providers. It's optional for specific platforms to derive this, but if they
-// do polling behavior is taken care of by this base class, and all the platform
-// need do is provide the underlying WLAN access API and polling policy.
-// Also designed this way for ease of testing the cross-platform behavior.
-class CONTENT_EXPORT WifiDataProviderCommon : public WifiDataProvider {
- public:
-  // Interface to abstract the low level data OS library call, and to allow
-  // mocking (hence public).
-  class WlanApiInterface {
-   public:
-    virtual ~WlanApiInterface() {}
-    // Gets wifi data for all visible access points.
-    virtual bool GetAccessPointData(WifiData::AccessPointDataSet* data) = 0;
-  };
-
-  WifiDataProviderCommon();
-
-  // WifiDataProvider implementation
-  void StartDataProvider() override;
-  void StopDataProvider() override;
-  bool GetData(WifiData* data) override;
-
- protected:
-  ~WifiDataProviderCommon() override;
-
-  // Returns ownership.
-  virtual WlanApiInterface* NewWlanApi() = 0;
-
-  // Returns ownership.
-  virtual WifiPollingPolicy* NewPollingPolicy() = 0;
-
- private:
-  // Runs a scan. Calls the callbacks if new data is found.
-  void DoWifiScanTask();
-
-  // Will schedule a scan; i.e. enqueue DoWifiScanTask deferred task.
-  void ScheduleNextScan(int interval);
-
-  WifiData wifi_data_;
-
-  // Whether we've successfully completed a scan for WiFi data.
-  bool is_first_scan_complete_;
-
-  // Underlying OS wifi API.
-  std::unique_ptr<WlanApiInterface> wlan_api_;
-
-  // Controls the polling update interval.
-  std::unique_ptr<WifiPollingPolicy> polling_policy_;
-
-  // Holder for delayed tasks; takes care of cleanup.
-  base::WeakPtrFactory<WifiDataProviderCommon> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(WifiDataProviderCommon);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_GEOLOCATION_WIFI_DATA_PROVIDER_COMMON_H_