Reland of Add task queue to Call.

webrtc/video/overuse_frame_detector.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 175 matching lines @@
       last_processed_capture_time_ms_(-1),
       num_pixels_(0),
       next_process_time_ms_(clock_->TimeInMilliseconds()),
       last_overuse_time_ms_(-1),
       checks_above_threshold_(0),
       num_overuse_detections_(0),
       last_rampup_time_ms_(-1),
       in_quick_rampup_(false),
       current_rampup_delay_ms_(kStandardRampUpDelayMs),
       usage_(new SendProcessingUsage(options)) {
-  RTC_DCHECK(metrics_observer);
   processing_thread_.DetachFromThread();
 }
 
 OveruseFrameDetector::~OveruseFrameDetector() {
 }
 
 void OveruseFrameDetector::EncodedFrameTimeMeasured(int encode_duration_ms) {
   if (!metrics_)
     metrics_ = rtc::Optional<CpuOveruseMetrics>(CpuOveruseMetrics());
   metrics_->encode_usage_percent = usage_->Value();
@@ skipping 166 matching lines @@
 bool OveruseFrameDetector::IsUnderusing(const CpuOveruseMetrics& metrics,
                                         int64_t time_now) {
   int delay = in_quick_rampup_ ? kQuickRampUpDelayMs : current_rampup_delay_ms_;
   if (time_now < last_rampup_time_ms_ + delay)
     return false;
 
   return metrics.encode_usage_percent <
          options_.low_encode_usage_threshold_percent;
 }
 }  // namespace webrtc