Refactor to make BlimpLocationProvider accessible to content layer.

content/browser/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 CONTENT_BROWSER_GEOLOCATION_LOCATION_ARBITRATOR_IMPL_H_
 #define CONTENT_BROWSER_GEOLOCATION_LOCATION_ARBITRATOR_IMPL_H_
 
 #include <stdint.h>
+#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 "content/browser/geolocation/location_arbitrator.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/access_token_store.h"
 #include "content/public/browser/location_provider.h"
 #include "content/public/common/geoposition.h"
 #include "net/url_request/url_request_context_getter.h"
@@ skipping 28 matching lines @@
   void StopProviders() override;
   void OnPermissionGranted() override;
   bool HasPermissionBeenGranted() const override;
 
  protected:
   AccessTokenStore* GetAccessTokenStore();
 
   // These functions are useful for injection of dependencies in derived
   // testing classes.
   virtual AccessTokenStore* NewAccessTokenStore();
-  virtual LocationProvider* NewNetworkLocationProvider(
+  virtual std::unique_ptr<LocationProvider> NewNetworkLocationProvider(
       AccessTokenStore* access_token_store,
       net::URLRequestContextGetter* context,
       const GURL& url,
       const base::string16& access_token);
-  virtual LocationProvider* NewSystemLocationProvider();
+  virtual std::unique_ptr<LocationProvider> NewSystemLocationProvider();
   virtual base::Time GetTimeNow() const;
 
  private:
-  // Takes ownership of |provider| on entry; it will either be added to
-  // |providers_| or deleted on error (e.g. it fails to start).
-  void RegisterProvider(LocationProvider* provider);
+  // 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,
       net::URLRequestContextGetter* context_getter);
   void 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;
 
   scoped_refptr<AccessTokenStore> access_token_store_;
   LocationUpdateCallback arbitrator_update_callback_;
   LocationProvider::LocationProviderUpdateCallback provider_update_callback_;
-  ScopedVector<LocationProvider> providers_;
+
+  // The CancelableCallback will prevent OnAccessTokenStoresLoaded from being
+  // called multiple times by calling Reset() at the time of binding.
+  base::CancelableCallback<void(AccessTokenStore::AccessTokenMap,
+                                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.
 LocationProvider* NewSystemLocationProvider();
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GEOLOCATION_LOCATION_ARBITRATOR_IMPL_H_