Adds EngineGeolocationFeature for Blimp Geolocation project.

blimp/engine/feature/geolocation/engine_geolocation_feature.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 BLIMP_ENGINE_FEATURE_GEOLOCATION_ENGINE_GEOLOCATION_FEATURE_H_
+#define BLIMP_ENGINE_FEATURE_GEOLOCATION_ENGINE_GEOLOCATION_FEATURE_H_
+
+#include <memory>
+
+#include "base/memory/weak_ptr.h"
+#include "blimp/engine/feature/geolocation/blimp_location_provider.h"
+#include "blimp/net/blimp_message_processor.h"
+#include "content/public/browser/geolocation_delegate.h"
+#include "content/public/browser/location_provider.h"
+#include "content/public/common/geoposition.h"
+
+namespace blimp {
+namespace engine {
+
+// Handles all incoming and outgoing protobuf messages types tied to
+// geolocation.
+class EngineGeolocationFeature : public BlimpMessageProcessor,
+                                 public BlimpLocationProvider::Delegate {
+ public:
+  EngineGeolocationFeature();
+  ~EngineGeolocationFeature() override;
+
+  void set_outgoing_message_processor(
+      std::unique_ptr<BlimpMessageProcessor> message_processor);
+
+  content::GeolocationDelegate* CreateGeolocationDelegate();
+
+  // BlimpMessageProcessor implementation.
+  void ProcessMessage(std::unique_ptr<BlimpMessage> message,
+                      const net::CompletionCallback& callback) override;
+
+ private:
+  void NotifyCallback(const content::Geoposition& position);
+
+  // BlimpLocationProvider::Delegate implementation.
+  void RequestAccuracy(
+      GeolocationSetInterestLevelMessage::Level level) override;
+  void RequestRefresh() override;
+  void SetUpdateCallback(const GeopositionReceivedCallback& callback) override;
+
+  std::unique_ptr<BlimpMessageProcessor> outgoing_message_processor_;
+  GeopositionReceivedCallback geoposition_received_callback_;
+  base::WeakPtrFactory<EngineGeolocationFeature> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(EngineGeolocationFeature);
+};
+
+}  // namespace engine
+}  // namespace blimp
+
+#endif  // BLIMP_ENGINE_FEATURE_GEOLOCATION_ENGINE_GEOLOCATION_FEATURE_H_