Revert 76228 - Move core pieces of geolocation from chrome to content.This is...

content/browser/geolocation/geolocation_provider.h

-// Copyright (c) 2010 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_GEOLOCATION_PROVIDER_H_
-#define CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_PROVIDER_H_
-#pragma once
-
-#include <map>
-
-#include "base/threading/thread.h"
-#include "chrome/common/geoposition.h"
-#include "content/browser/geolocation/geolocation_observer.h"
-#include "googleurl/src/gurl.h"
-
-class GeolocationArbitrator;
-
-template<typename Type>
-struct DefaultSingletonTraits;
-
-// This is the main API to the geolocaiton subsystem. The application
-// will hold a single instance of this class, and can register multiple
-// observers which will be notified of location updates. Underlying location
-// arbitrator will only be enabled whilst there is at least one observer
-// registered.
-class GeolocationProvider : public base::Thread, public GeolocationObserver {
- public:
-  GeolocationProvider();
-
-  // Must be called from the same thread as the GeolocationProvider was created
-  // on. The GeolocationObserverOptions passed are used as a 'hint' for the
-  // provider preferences for this particular observer, however the observer
-  // could receive callbacks for best available locations from any active
-  // provider whilst it is registered.
-  // If an existing observer is added a second time it's options are updated
-  // but only a single call to RemoveObserver() is required to remove it.
-  void AddObserver(GeolocationObserver* delegate,
-                   const GeolocationObserverOptions& update_options);
-
-  // Remove a previously registered observer. No-op if not previously registered
-  // via AddObserver(). Returns true if the observer was removed.
-  bool RemoveObserver(GeolocationObserver* delegate);
-
-  void OnPermissionGranted(const GURL& requesting_frame);
-  bool HasPermissionBeenGranted() const;
-
-  // GeolocationObserver
-  virtual 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. Ownership is NOT
-  // returned.
-  static GeolocationProvider* GetInstance();
-
-  typedef std::map<GeolocationObserver*, GeolocationObserverOptions>
-      ObserverMap;
-
- private:
-  friend struct DefaultSingletonTraits<GeolocationProvider>;
-  ~GeolocationProvider();
-
-  bool OnClientThread() const;
-  bool OnGeolocationThread() const;
-
-  // When the observer list changes, we may start the thread and the required
-  // providers, or stop them.
-  void OnObserversChanged();
-
-  // Stop the providers when there are no more observers. Note that once our
-  // thread is started, we'll keep it alive (but with no pending messages).
-  void StopProviders();
-
-  // Starts or updates the observers' geolocation options
-  // (delegates to arbitrator).
-  void StartProviders(const GeolocationObserverOptions& options);
-
-  // Update the providers on the geolocation thread, which must be running.
-  void InformProvidersPermissionGranted(const GURL& requesting_frame);
-
-  // Notifies observers when a new position fix is available.
-  void NotifyObservers(const Geoposition& position);
-
-  // Thread
-  virtual void Init();
-  virtual void CleanUp();
-
-  scoped_refptr<base::MessageLoopProxy> client_loop_;
-
-  // Only used on client thread
-  ObserverMap observers_;
-  GURL most_recent_authorized_frame_;
-  Geoposition position_;
-
-  // Only to be used on the geolocation thread.
-  GeolocationArbitrator* arbitrator_;
-
-  DISALLOW_COPY_AND_ASSIGN(GeolocationProvider);
-};
-
-#endif  // CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_PROVIDER_H_