Revert of Switch to use SequencedTaskChecker instead of ThreadChecker where needed.

webrtc/modules/video_coding/video_sender.cc

 /*
  *  Copyright (c) 2013 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.
  */
 
@@ skipping 25 matching lines @@
       frame_dropper_enabled_(true),
       _sendStatsTimer(1000, clock_),
       current_codec_(),
       encoder_params_({0, 0, 0, 0}),
       encoder_has_internal_source_(false),
       next_frame_types_(1, kVideoFrameDelta) {
   _mediaOpt.Reset();
   // Allow VideoSender to be created on one thread but used on another, post
   // construction. This is currently how this class is being used by at least
   // one external project (diffractor).
-  sequenced_checker_.Detach();
+  main_thread_.DetachFromThread();
 }
 
 VideoSender::~VideoSender() {}
 
 void VideoSender::Process() {
   if (_sendStatsTimer.TimeUntilProcess() == 0) {
     // |_sendStatsTimer.Processed()| must be called. Otherwise
     // VideoSender::Process() will be called in an infinite loop.
     _sendStatsTimer.Processed();
     if (send_stats_callback_) {
@@ skipping 18 matching lines @@
 }
 
 int64_t VideoSender::TimeUntilNextProcess() {
   return _sendStatsTimer.TimeUntilProcess();
 }
 
 // Register the send codec to be used.
 int32_t VideoSender::RegisterSendCodec(const VideoCodec* sendCodec,
                                        uint32_t numberOfCores,
                                        uint32_t maxPayloadSize) {
-  RTC_DCHECK(sequenced_checker_.CalledSequentially());
+  RTC_DCHECK(main_thread_.CalledOnValidThread());
   rtc::CritScope lock(&encoder_crit_);
   if (sendCodec == nullptr) {
     return VCM_PARAMETER_ERROR;
   }
 
   bool ret =
       _codecDataBase.SetSendCodec(sendCodec, numberOfCores, maxPayloadSize);
 
   // Update encoder regardless of result to make sure that we're not holding on
   // to a deleted instance.
@@ skipping 47 matching lines @@
                             sendCodec->height, sendCodec->maxFramerate,
                             numLayers, maxPayloadSize);
   return VCM_OK;
 }
 
 // Register an external decoder object.
 // This can not be used together with external decoder callbacks.
 void VideoSender::RegisterExternalEncoder(VideoEncoder* externalEncoder,
                                           uint8_t payloadType,
                                           bool internalSource /*= false*/) {
-  RTC_DCHECK(sequenced_checker_.CalledSequentially());
+  RTC_DCHECK(main_thread_.CalledOnValidThread());
 
   rtc::CritScope lock(&encoder_crit_);
 
   if (externalEncoder == nullptr) {
     bool wasSendCodec = false;
     RTC_CHECK(
         _codecDataBase.DeregisterExternalEncoder(payloadType, &wasSendCodec));
     if (wasSendCodec) {
       // Make sure the VCM doesn't use the de-registered codec
       rtc::CritScope params_lock(&params_crit_);
       _encoder = nullptr;
       encoder_has_internal_source_ = false;
     }
     return;
   }
   _codecDataBase.RegisterExternalEncoder(externalEncoder, payloadType,
                                          internalSource);
 }
 
 // Get encode bitrate
 int VideoSender::Bitrate(unsigned int* bitrate) const {
-  RTC_DCHECK(sequenced_checker_.CalledSequentially());
+  RTC_DCHECK(main_thread_.CalledOnValidThread());
   // Since we're running on the thread that's the only thread known to modify
   // the value of _encoder, we don't need to grab the lock here.
 
   if (!_encoder)
     return VCM_UNINITIALIZED;
   *bitrate = _encoder->GetEncoderParameters().target_bitrate;
   return 0;
 }
 
 // Get encode frame rate
 int VideoSender::FrameRate(unsigned int* framerate) const {
-  RTC_DCHECK(sequenced_checker_.CalledSequentially());
+  RTC_DCHECK(main_thread_.CalledOnValidThread());
   // Since we're running on the thread that's the only thread known to modify
   // the value of _encoder, we don't need to grab the lock here.
 
   if (!_encoder)
     return VCM_UNINITIALIZED;
 
   *framerate = _encoder->GetEncoderParameters().input_frame_rate;
   return 0;
 }
 
@@ skipping 160 matching lines @@
 }
 
 int32_t VideoSender::EnableFrameDropper(bool enable) {
   rtc::CritScope lock(&encoder_crit_);
   frame_dropper_enabled_ = enable;
   _mediaOpt.EnableFrameDropper(enable);
   return VCM_OK;
 }
 }  // namespace vcm
 }  // namespace webrtc