[chrome.displaySource] Move video stream info creation to encoders.

extensions/renderer/api/display_source/wifi_display/wifi_display_video_encoder.cc

 // 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.
 
 #include "extensions/renderer/api/display_source/wifi_display/wifi_display_video_encoder.h"
 
 #include "base/logging.h"
 
+#include "extensions/renderer/api/display_source/wifi_display/wifi_display_elementary_stream_descriptor.h"
+
 namespace extensions {
 
 WiFiDisplayVideoEncoder::InitParameters::InitParameters() = default;
 WiFiDisplayVideoEncoder::InitParameters::InitParameters(const InitParameters&) =
     default;
 WiFiDisplayVideoEncoder::InitParameters::~InitParameters() = default;
 
 WiFiDisplayVideoEncoder::WiFiDisplayVideoEncoder(
     scoped_refptr<base::SingleThreadTaskRunner> media_task_runner)
     : media_task_runner_(std::move(media_task_runner)), send_idr_(false) {
   DCHECK(media_task_runner_);
+
+  // Add descriptors common to all H.264 video encoders.
+  descriptors_.push_back(
+      WiFiDisplayElementaryStreamDescriptor::AVCTimingAndHRD::Create());
 }
 
 WiFiDisplayVideoEncoder::~WiFiDisplayVideoEncoder() = default;
 
 // static
 void WiFiDisplayVideoEncoder::Create(
     const InitParameters& params,
     const VideoEncoderCallback& encoder_callback) {
   CreateVEA(params, encoder_callback);
 }
 
+WiFiDisplayElementaryStreamInfo
+WiFiDisplayVideoEncoder::CreateElementaryStreamInfo() const {
+  DCHECK(client_thread_checker_.CalledOnValidThread());
+  return WiFiDisplayElementaryStreamInfo(
+      WiFiDisplayElementaryStreamInfo::VIDEO_H264, descriptors_);
+}
+
 void WiFiDisplayVideoEncoder::InsertRawVideoFrame(
     const scoped_refptr<media::VideoFrame>& video_frame,
     base::TimeTicks reference_time) {
   DCHECK(client_thread_checker_.CalledOnValidThread());
   DCHECK(!encoded_callback_.is_null());
   media_task_runner_->PostTask(
       FROM_HERE, base::Bind(&WiFiDisplayVideoEncoder::InsertFrameOnMediaThread,
                             this, video_frame, reference_time, send_idr_));
   send_idr_ = false;
 }
 
 void WiFiDisplayVideoEncoder::RequestIDRPicture() {
   DCHECK(client_thread_checker_.CalledOnValidThread());
   send_idr_ = true;
 }
 
 }  // namespace extensions