Adding basic implementation of AudioNetworkAdaptor.

webrtc/modules/audio_coding/audio_network_adaptor/controller_manager.cc

+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <utility>
+
+#include "webrtc/modules/audio_coding/audio_network_adaptor/controller_manager.h"
+
+namespace webrtc {
+
+ControllerManager::Config::Config() = default;
+
+ControllerManager::Config::~Config() = default;
+
+ControllerManager::ControllerManager(const Config& config) : config_(config) {}
+
+ControllerManager::ControllerManager(
+    const Config& config,
+    std::vector<std::unique_ptr<Controller>> controllers)
+    : config_(config), controllers_(std::move(controllers)) {
+  for (auto& controller : controllers_) {
+    default_sorted_controllers_.push_back(controller.get());
+  }
+}
+
+ControllerManager::~ControllerManager() = default;
+
+std::vector<Controller*> ControllerManager::GetSortedControllers(
+    const Controller::NetworkMetrics& metrics) {
+  // TODO(minyue): Reorder controllers according to their significance.
+  return default_sorted_controllers_;
+}
+
+std::vector<Controller*> ControllerManager::GetControllers() const {
+  return default_sorted_controllers_;
+}
+
+}  // namespace webrtc