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

device/geolocation/geolocation_provider_impl.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 DEVICE_GEOLOCATION_GEOLOCATION_PROVIDER_IMPL_H_
-#define DEVICE_GEOLOCATION_GEOLOCATION_PROVIDER_IMPL_H_
-
-#include <list>
-#include <memory>
-#include <vector>
-
-#include "base/callback_forward.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/threading/thread.h"
-#include "device/geolocation/geolocation_export.h"
-#include "device/geolocation/geolocation_provider.h"
-#include "device/geolocation/geoposition.h"
-
-namespace base {
-template<typename Type> struct DefaultSingletonTraits;
-class SingleThreadTaskRunner;
-}
-
-namespace device {
-class LocationArbitrator;
-
-class DEVICE_GEOLOCATION_EXPORT GeolocationProviderImpl
-    : public NON_EXPORTED_BASE(GeolocationProvider),
-      public base::Thread {
- public:
-  // GeolocationProvider implementation:
-  std::unique_ptr<GeolocationProvider::Subscription> AddLocationUpdateCallback(
-      const LocationUpdateCallback& callback,
-      bool enable_high_accuracy) override;
-  void UserDidOptIntoLocationServices() override;
-  void OverrideLocationForTesting(const Geoposition& position) override;
-
-  // Callback from the LocationArbitrator. Public for testing.
-  void OnLocationUpdate(const Geoposition& position);
-
-  // Gets a pointer to the singleton instance of the location relayer, which
-  // is in turn bound to the browser's global context objects. This must only be
-  // called on the UI thread so that the GeolocationProviderImpl is always
-  // instantiated on the same thread. Ownership is NOT returned.
-  static GeolocationProviderImpl* GetInstance();
-
-  bool user_did_opt_into_location_services_for_testing() {
-    return user_did_opt_into_location_services_;
-  }
-
- protected:
-  friend struct base::DefaultSingletonTraits<GeolocationProviderImpl>;
-  GeolocationProviderImpl();
-  ~GeolocationProviderImpl() override;
-
-  // Useful for injecting mock geolocation arbitrator in tests.
-  // TODO(mvanouwerkerk): Use something like SetArbitratorForTesting instead.
-  virtual std::unique_ptr<LocationArbitrator> CreateArbitrator();
-
- private:
-  bool OnGeolocationThread() const;
-
-  // Start and stop providers as needed when clients are added or removed.
-  void OnClientsChanged();
-
-  // Stops the providers when there are no more registered clients. Note that
-  // once the Geolocation thread is started, it will stay alive (but sitting
-  // idle without any pending messages).
-  void StopProviders();
-
-  // Starts the geolocation providers or updates their options (delegates to
-  // arbitrator).
-  void StartProviders(bool enable_high_accuracy);
-
-  // Updates the providers on the geolocation thread, which must be running.
-  void InformProvidersPermissionGranted();
-
-  // Notifies all registered clients that a position update is available.
-  void NotifyClients(const Geoposition& position);
-
-  // Thread
-  void Init() override;
-  void CleanUp() override;
-
-  base::CallbackList<void(const Geoposition&)> high_accuracy_callbacks_;
-  base::CallbackList<void(const Geoposition&)> low_accuracy_callbacks_;
-
-  bool user_did_opt_into_location_services_;
-  Geoposition position_;
-
-  // True only in testing, where we want to use a custom position.
-  bool ignore_location_updates_;
-
-  // Only to be used on the geolocation thread.
-  std::unique_ptr<LocationArbitrator> arbitrator_;
-
-  // Used to PostTask()s from the geolocation thread to creation thread.
-  const scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
-
-  DISALLOW_COPY_AND_ASSIGN(GeolocationProviderImpl);
-};
-
-}  // namespace device
-
-#endif  // DEVICE_GEOLOCATION_GEOLOCATION_PROVIDER_IMPL_H_