New api function CreateVideoStreamEncoder.

Bug: webrtc:8830
Change-Id: I01de86f601e48f76e6b41b4182ce006d397a190c
Reviewed-on: https://webrtc-review.googlesource.com/78260
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24079}

api/video/video_stream_encoder_settings.h

@@ -0,0 +1,31 @@
+/*
+ *  Copyright (c) 2018 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.
+ */
+
+#ifndef API_VIDEO_VIDEO_STREAM_ENCODER_SETTINGS_H_
+#define API_VIDEO_VIDEO_STREAM_ENCODER_SETTINGS_H_
+
+#include "api/video_codecs/video_encoder_factory.h"
+
+namespace webrtc {
+
+struct VideoStreamEncoderSettings {
+  VideoStreamEncoderSettings() = default;
+
+  // Enables the new method to estimate the cpu load from encoding, used for
+  // cpu adaptation.
+  bool experiment_cpu_load_estimator = false;
+
+  // Ownership stays with WebrtcVideoEngine (delegated from PeerConnection).
+  VideoEncoderFactory* encoder_factory = nullptr;
+};
+
+}  // namespace webrtc
+
+#endif  // API_VIDEO_VIDEO_STREAM_ENCODER_SETTINGS_H_