Revert of Reland: Geolocation: move from content/browser to device/

content/browser/geolocation/geolocation_provider_impl.h

Index: content/browser/geolocation/geolocation_provider_impl.h
diff --git a/content/browser/geolocation/geolocation_provider_impl.h b/content/browser/geolocation/geolocation_provider_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..b7c7e9dcbc9ed7681dad836f2f831a8500e88475
--- /dev/null
+++ b/content/browser/geolocation/geolocation_provider_impl.h
@@ -0,0 +1,102 @@
+// 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_GEOLOCATION_PROVIDER_IMPL_H_
+#define CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_PROVIDER_IMPL_H_
+
+#include <list>
+#include <memory>
+#include <vector>
+
+#include "base/callback_forward.h"
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/threading/thread.h"
+#include "content/common/content_export.h"
+#include "content/public/browser/geolocation_provider.h"
+#include "content/public/common/geoposition.h"
+
+namespace base {
+template<typename Type> struct DefaultSingletonTraits;
+}
+
+namespace content {
+class LocationArbitrator;
+
+class CONTENT_EXPORT GeolocationProviderImpl
+    : public NON_EXPORTED_BASE(GeolocationProvider),
+      public base::Thread {
+ public:
+  // GeolocationProvider implementation:
+  std::unique_ptr<GeolocationProvider::Subscription> AddLocationUpdateCallback(
+      const LocationUpdateCallback& callback,
+      bool enable_high_accuracy) override;
+  void UserDidOptIntoLocationServices() override;
+  void OverrideLocationForTesting(const Geoposition& position) override;
+
+  // Callback from the LocationArbitrator. Public for testing.
+  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. This must only be
+  // called on the UI thread so that the GeolocationProviderImpl is always
+  // instantiated on the same thread. Ownership is NOT returned.
+  static GeolocationProviderImpl* GetInstance();
+
+  bool user_did_opt_into_location_services_for_testing() {
+    return user_did_opt_into_location_services_;
+  }
+
+ protected:
+  friend struct base::DefaultSingletonTraits<GeolocationProviderImpl>;
+  GeolocationProviderImpl();
+  ~GeolocationProviderImpl() override;
+
+  // Useful for injecting mock geolocation arbitrator in tests.
+  // TODO(mvanouwerkerk): Use something like SetArbitratorForTesting instead.
+  virtual std::unique_ptr<LocationArbitrator> CreateArbitrator();
+
+ private:
+  bool OnGeolocationThread() const;
+
+  // Start and stop providers as needed when clients are added or removed.
+  void OnClientsChanged();
+
+  // Stops the providers when there are no more registered clients. Note that
+  // once the Geolocation thread is started, it will stay alive (but sitting
+  // idle without any pending messages).
+  void StopProviders();
+
+  // Starts the geolocation providers or updates their options (delegates to
+  // arbitrator).
+  void StartProviders(bool enable_high_accuracy);
+
+  // Updates the providers on the geolocation thread, which must be running.
+  void InformProvidersPermissionGranted();
+
+  // Notifies all registered clients that a position update is available.
+  void NotifyClients(const Geoposition& position);
+
+  // Thread
+  void Init() override;
+  void CleanUp() override;
+
+  base::CallbackList<void(const Geoposition&)> high_accuracy_callbacks_;
+  base::CallbackList<void(const Geoposition&)> low_accuracy_callbacks_;
+
+  bool user_did_opt_into_location_services_;
+  Geoposition position_;
+
+  // True only in testing, where we want to use a custom position.
+  bool ignore_location_updates_;
+
+  // Only to be used on the geolocation thread.
+  std::unique_ptr<LocationArbitrator> arbitrator_;
+
+  DISALLOW_COPY_AND_ASSIGN(GeolocationProviderImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_GEOLOCATION_GEOLOCATION_PROVIDER_IMPL_H_