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

content/browser/geolocation/location_api_adapter_android.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_API_ADAPTER_ANDROID_H_
-#define CONTENT_BROWSER_GEOLOCATION_LOCATION_API_ADAPTER_ANDROID_H_
-
-#include "base/android/jni_weak_ref.h"
-#include "base/android/scoped_java_ref.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/singleton.h"
-#include "base/synchronization/lock.h"
-
-namespace base {
-class SingleThreadTaskRunner;
-}
-
-namespace content {
-class LocationProviderAndroid;
-struct Geoposition;
-
-// Interacts with JNI and reports back to LocationProviderAndroid. This class
-// creates a LocationProvider java object and listens for updates.
-// The simplified flow is:
-//   - GeolocationProvider runs in a Geolocation Thread and fetches geolocation
-//     data from a LocationProvider.
-//   - LocationProviderAndroid accesses a singleton AndroidLocationApiAdapter.
-//   - AndroidLocationApiAdapter calls via JNI and uses the main thread Looper
-//     in the java side to listen for location updates. We then bounce these
-//     updates to the Geolocation thread.
-//
-// Note that AndroidLocationApiAdapter is a singleton and there's at most only
-// one LocationProviderAndroid that has called Start().
-class AndroidLocationApiAdapter {
- public:
-  // Starts the underlying location provider, returns true if successful.
-  // Called on the Geolocation thread.
-  bool Start(LocationProviderAndroid* location_provider, bool high_accuracy);
-  // Stops the underlying location provider.
-  // Called on the Geolocation thread.
-  void Stop();
-
-  // Returns our singleton.
-  static AndroidLocationApiAdapter* GetInstance();
-
-  // Called when initializing chrome_view to obtain a pointer to the java class.
-  static bool RegisterGeolocationService(JNIEnv* env);
-
-  // Called by JNI on main thread looper.
-  static void OnNewLocationAvailable(double latitude,
-                                     double longitude,
-                                     double time_stamp,
-                                     bool has_altitude, double altitude,
-                                     bool has_accuracy, double accuracy,
-                                     bool has_heading, double heading,
-                                     bool has_speed, double speed);
-  static void OnNewErrorAvailable(JNIEnv* env, jstring message);
-
- private:
-  friend struct base::DefaultSingletonTraits<AndroidLocationApiAdapter>;
-  AndroidLocationApiAdapter();
-  ~AndroidLocationApiAdapter();
-
-  void CreateJavaObject(JNIEnv* env);
-
-  // Called on the JNI main thread looper.
-  void OnNewGeopositionInternal(const Geoposition& geoposition);
-
-  /// Called on the Geolocation thread.
-  static void NotifyProviderNewGeoposition(const Geoposition& geoposition);
-
-  base::android::ScopedJavaGlobalRef<jobject>
-      java_location_provider_android_object_;
-  // TODO(mvanouwerkerk): Use a callback instead of holding a pointer.
-  LocationProviderAndroid* location_provider_;  // Owned by the arbitrator.
-
-  // Guards against the following member which is accessed on Geolocation
-  // thread and the JNI main thread looper.
-  base::Lock lock_;
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_GEOLOCATION_LOCATION_API_ADAPTER_ANDROID_H_