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

content/browser/geolocation/wifi_data_provider_common.h

Index: content/browser/geolocation/wifi_data_provider_common.h
diff --git a/content/browser/geolocation/wifi_data_provider_common.h b/content/browser/geolocation/wifi_data_provider_common.h
new file mode 100644
index 0000000000000000000000000000000000000000..b7439633809d010a7db40b8c0eaf8a778a1b0b05
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+++ b/content/browser/geolocation/wifi_data_provider_common.h
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+// 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_