message: Fixing audio timestamp stall during inactivation (under a kill switch)
  TEST: tested on chromium.
  Cr-Commit-Position: refs/heads/master@{#33080}
diff: @@ -241,6 +241,8 @@ class ChannelSend : public ChannelSendInterface,
  // Defined last to ensure that there are no running tasks when the other
  // members are destroyed.
  rtc::TaskQueue encoder_queue_;
  +
  + const bool fixing_timestamp_stall_;
  };
  const int kTelephoneEventAttenuationdB = 10;
  @@ -471,7 +473,9 @@ ChannelSend::ChannelSend(
  crypto_options_(crypto_options),
  encoder_queue_(task_queue_factory->CreateTaskQueue(
  "AudioEncoder",
  - TaskQueueFactory::Priority::NORMAL)) {
  + TaskQueueFactory::Priority::NORMAL)),
  + fixing_timestamp_stall_(
  + !field_trial::IsDisabled("WebRTC-Audio-FixTimestampStall")) {
  RTC_DCHECK(module_process_thread);
  module_process_thread_checker_.Detach();
  @@ -808,6 +812,10 @@ void ChannelSend::ProcessAndEncodeAudio(
  [this, audio_frame = std::move(audio_frame)]() mutable {
  RTC_DCHECK_RUN_ON(&encoder_queue_);
  if (!encoder_queue_is_active_) {
  + if (fixing_timestamp_stall_) {
  + _timeStamp +=
  + static_cast<uint32_t>(audio_frame->samples_per_channel_);
  + }
  return;
  }
  // Measure time between when the audio frame is added to the task queue
  