Add WebrtcCaptureScheduler interface.

remoting/protocol/webrtc_frame_scheduler.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 REMOTING_PROTOCOL_WEBRTC_FRAME_SCHEDULER_H_
+#define REMOTING_PROTOCOL_WEBRTC_FRAME_SCHEDULER_H_
+
+#include "base/callback_forward.h"
+#include "remoting/codec/webrtc_video_encoder.h"
+#include "third_party/webrtc/video_encoder.h"
+
+namespace remoting {
+namespace protocol {
+
+// An abstract interface for frame schedulers, which are responsible for
+// scheduling when video frames are captured and for defining encoding
+// parameters for each frame.
+class WebrtcFrameScheduler {
+ public:
+  WebrtcFrameScheduler() {}
+  virtual ~WebrtcFrameScheduler() {}
+
+  // Starts the scheduler. |capture_callback| will be called whenever a new
+  // frame should be captured.
+  virtual void Start(const base::Closure& capture_callback) = 0;
+
+  // Pause and resumes the scheduler.
+  virtual void Pause(bool pause) = 0;
+
+  // Requests a key frame.
+  virtual void SetKeyFrameRequest() = 0;
+
+  // Sets network bitrate estimate.
+  virtual void SetTargetBitrate(int bitrate_kbps) = 0;
+
+  // Called after |frame| has been captured to get encoding parameters for the
+  // frame. Returns false if the frame should be dropped (e.g. when there are
+  // no changed), true otherwise.
+  virtual bool GetEncoderFrameParams(
+      const webrtc::DesktopFrame& frame,
+      WebrtcVideoEncoder::FrameParams* params_out) = 0;
+
+  // Called after a frame has been encoded and passed to the sender.
+  virtual void OnFrameEncoded(
+      const WebrtcVideoEncoder::EncodedFrame& encoded_frame,
+      const webrtc::EncodedImageCallback::Result& send_result) = 0;
+};
+
+}  // namespace protocol
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_WEBRTC_FRAME_SCHEDULER_H_