Reland 2:Geolocation: move from content/browser to device/

content/public/browser/geolocation_provider.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_PUBLIC_BROWSER_GEOLOCATION_PROVIDER_H_
-#define CONTENT_PUBLIC_BROWSER_GEOLOCATION_PROVIDER_H_
-
-#include <memory>
-
-#include "base/callback_list.h"
-#include "content/common/content_export.h"
-
-namespace content {
-class GeolocationDelegate;
-struct Geoposition;
-
-// This is the main API to the geolocation subsystem. The application will hold
-// a single instance of this class and can register multiple clients to be
-// notified of location changes:
-// * Callbacks are registered by AddLocationUpdateCallback() and will keep
-//   receiving updates until the returned subscription object is destructed.
-// The application must instantiate the GeolocationProvider on the UI thread and
-// must communicate with it on the same thread.
-// The underlying location arbitrator will only be enabled whilst there is at
-// least one registered observer or pending callback (and only after
-// UserDidOptIntoLocationServices). The arbitrator and the location providers it
-// uses run on a separate Geolocation thread.
-class GeolocationProvider {
- public:
-  CONTENT_EXPORT static GeolocationProvider* GetInstance();
-
-  // Optional: provide a Delegate to override typical services.
-  CONTENT_EXPORT static void SetGeolocationDelegate(
-      GeolocationDelegate* delegate);
-
-  typedef base::Callback<void(const Geoposition&)> LocationUpdateCallback;
-  typedef base::CallbackList<void(const Geoposition&)>::Subscription
-      Subscription;
-
-  // |enable_high_accuracy| is used as a 'hint' for the provider preferences for
-  // this particular observer, however the observer could receive updates for
-  // best available locations from any active provider whilst it is registered.
-  virtual std::unique_ptr<Subscription> AddLocationUpdateCallback(
-      const LocationUpdateCallback& callback,
-      bool enable_high_accuracy) = 0;
-
-  // Calling this method indicates the user has opted into using location
-  // services, including sending network requests to [Google servers to] resolve
-  // the user's location. Use this method carefully, in line with the rules in
-  // go/chrome-privacy-doc.
-  virtual void UserDidOptIntoLocationServices() = 0;
-
-  // Overrides the current location for testing.
-  //
-  // Overrides the location for automation/testing. Suppresses any further
-  // updates from the actual providers and sends an update with the overridden
-  // position to all registered clients.
-  //
-  // Do not use this function in unit tests. The function instantiates the
-  // singleton geolocation stack in the background and manipulates it to report
-  // a fake location. Neither step can be undone, breaking unit test isolation
-  // (crbug.com/125931).
-  virtual void OverrideLocationForTesting(const Geoposition& position) = 0;
-
- protected:
-  virtual~GeolocationProvider() {}
-};
-
-}  // namespace content
-
-#endif  // CONTENT_PUBLIC_BROWSER_GEOLOCATION_PROVIDER_H_