Gets rid of the LocationArbitrator interface, in preference for LocationProvider.

device/geolocation/location_arbitrator_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_LOCATION_ARBITRATOR_IMPL_H_
 #define DEVICE_GEOLOCATION_LOCATION_ARBITRATOR_IMPL_H_
 
 #include <stdint.h>
+#include <memory>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/cancelable_callback.h"
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "device/geolocation/access_token_store.h"
 #include "device/geolocation/geolocation_export.h"
 #include "device/geolocation/geolocation_provider.h"
 #include "device/geolocation/geoposition.h"
-#include "device/geolocation/location_arbitrator.h"
 #include "device/geolocation/location_provider.h"
 #include "net/url_request/url_request_context_getter.h"
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace device {
 class AccessTokenStore;
 class GeolocationDelegate;
 class LocationProvider;
 
 // This class is responsible for handling updates from multiple underlying
 // providers and resolving them to a single 'best' location fix at any given
 // moment.
 class DEVICE_GEOLOCATION_EXPORT LocationArbitratorImpl
-    : public LocationArbitrator {
+    : public LocationProvider {
  public:
   // Number of milliseconds newer a location provider has to be that it's worth
   // switching to this location provider on the basis of it being fresher
   // (regardles of relative accuracy). Public for tests.
   static const int64_t kFixStaleTimeoutMilliseconds;
 
-  typedef base::Callback<void(const Geoposition&)> LocationUpdateCallback;
-
-  LocationArbitratorImpl(const LocationUpdateCallback& callback,
-                         GeolocationDelegate* delegate);
+  explicit LocationArbitratorImpl(GeolocationDelegate* delegate);
   ~LocationArbitratorImpl() override;
 
   static GURL DefaultNetworkProviderURL();
+  bool HasPermissionBeenGrantedForTest() const;
 
-  // LocationArbitrator
-  void StartProviders(bool enable_high_accuracy) override;
-  void StopProviders() override;
+  // LocationProvider implementation.
+  void SetUpdateCallback(
+      const LocationProviderUpdateCallback& callback) override;
+  bool StartProvider(bool enable_high_accuracy) override;
+  void StopProvider() override;
+  const Geoposition& GetPosition() override;
   void OnPermissionGranted() override;
-  bool HasPermissionBeenGranted() const override;
 
  protected:
   // These functions are useful for injection of dependencies in derived
   // testing classes.
   virtual scoped_refptr<AccessTokenStore> NewAccessTokenStore();
   virtual std::unique_ptr<LocationProvider> NewNetworkLocationProvider(
       const scoped_refptr<AccessTokenStore>& access_token_store,
       const scoped_refptr<net::URLRequestContextGetter>& context,
       const GURL& url,
       const base::string16& access_token);
   virtual std::unique_ptr<LocationProvider> NewSystemLocationProvider();
   virtual base::Time GetTimeNow() const;
 
  private:
   friend class TestingLocationArbitrator;
 
   scoped_refptr<AccessTokenStore> GetAccessTokenStore();
 
   // Provider will either be added to |providers_| or
   // deleted on error (e.g. it fails to start).
   void RegisterProvider(std::unique_ptr<LocationProvider> provider);
 
   void RegisterSystemProvider();
   void OnAccessTokenStoresLoaded(
       AccessTokenStore::AccessTokenMap access_token_map,
       const scoped_refptr<net::URLRequestContextGetter>& context_getter);
-  void DoStartProviders();
+  bool DoStartProviders();
 
   // Gets called when a provider has a new position.
   void OnLocationUpdate(const LocationProvider* provider,
                         const Geoposition& new_position);
 
   // Returns true if |new_position| is an improvement over |old_position|.
   // Set |from_same_provider| to true if both the positions came from the same
   // provider.
   bool IsNewPositionBetter(const Geoposition& old_position,
                            const Geoposition& new_position,
                            bool from_same_provider) const;
 
   GeolocationDelegate* delegate_;
 
   scoped_refptr<AccessTokenStore> access_token_store_;
-  LocationUpdateCallback arbitrator_update_callback_;
-  LocationProvider::LocationProviderUpdateCallback provider_update_callback_;
+  LocationProvider::LocationProviderUpdateCallback arbitrator_update_callback_;
 
   // The CancelableCallback will prevent OnAccessTokenStoresLoaded from being
   // called multiple times by calling Reset() at the time of binding.
   base::CancelableCallback<void(
       AccessTokenStore::AccessTokenMap,
       const scoped_refptr<net::URLRequestContextGetter>&)>
       token_store_callback_;
   std::vector<std::unique_ptr<LocationProvider>> providers_;
   bool enable_high_accuracy_;
   // The provider which supplied the current |position_|
   const LocationProvider* position_provider_;
   bool is_permission_granted_;
   // The current best estimate of our position.
   Geoposition position_;
 
   // Tracks whether providers should be running.
   bool is_running_;
 
   DISALLOW_COPY_AND_ASSIGN(LocationArbitratorImpl);
 };
 
 // Factory functions for the various types of location provider to abstract
 // over the platform-dependent implementations.
 std::unique_ptr<LocationProvider> NewSystemLocationProvider();
 
 }  // namespace device
 
 #endif  // DEVICE_GEOLOCATION_LOCATION_ARBITRATOR_IMPL_H_