Hooks together Geolocation Feature in the Client and Engine.

device/geolocation/rate_limiting_location_provider_proxy.h

+// Copyright 2016 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 DEVICE_GEOLOCATION_RATE_LIMITING_LOCATION_PROVIDER_PROXY_H_
+#define DEVICE_GEOLOCATION_RATE_LIMITING_LOCATION_PROVIDER_PROXY_H_
+
+#include <memory>
+
+#include "device/geolocation/geolocation_delegate.h"
+#include "device/geolocation/geoposition.h"
+#include "device/geolocation/location_provider.h"
+
+namespace device {
+
+// Location provider that limits the rate of geolocation updates.
+// TODO(lethalantidote): Schedule aspect still to be implemented. Dummy for now.
+class DEVICE_GEOLOCATION_EXPORT RateLimitingLocationProviderProxy
+    : public LocationProvider {
+ public:
+  explicit RateLimitingLocationProviderProxy(
+      std::unique_ptr<LocationProvider> provider);
+  ~RateLimitingLocationProviderProxy() override;
+
+  // LocationProvider implemenation.
+  void SetUpdateCallback(
+      const LocationProviderUpdateCallback& callback) override;
+  bool StartProvider(bool enable_high_accuracy) override;
+  void StopProvider() override;
+  const Geoposition& GetPosition() override;
+  void OnPermissionGranted() override;
+
+ private:
+  // Limits the rate at which location updates from |location_provider_| will
+  // get passed along through |feature_update_callback_|.
+  void OnLocationUpdate(const LocationProvider* provider,
+                        const Geoposition& new_position);
+
+  std::unique_ptr<LocationProvider> location_provider_;
+  LocationProvider::LocationProviderUpdateCallback location_update_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(RateLimitingLocationProviderProxy);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_GEOLOCATION_RATE_LIMITING_LOCATION_PROVIDER_PROXY_H_