Adding ThreadChecker validation to d'tors for protocol classes

remoting/protocol/webrtc_frame_scheduler_simple.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 "remoting/protocol/webrtc_frame_scheduler_simple.h"
 
 #include <algorithm>
 
 #include "remoting/protocol/frame_stats.h"
 #include "remoting/protocol/webrtc_dummy_video_encoder.h"
@@ skipping 110 matching lines @@
     current_target_bitrate_ = target_bitrate;
   }
 }
 
 WebrtcFrameSchedulerSimple::WebrtcFrameSchedulerSimple()
     : pacing_bucket_(LeakyBucket::kUnlimitedDepth, 0),
       frame_processing_delay_us_(kStatsWindow),
       updated_region_area_(kStatsWindow),
       weak_factory_(this) {}
 
-WebrtcFrameSchedulerSimple::~WebrtcFrameSchedulerSimple() {}
+WebrtcFrameSchedulerSimple::~WebrtcFrameSchedulerSimple() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
 
 void WebrtcFrameSchedulerSimple::OnKeyFrameRequested() {
   DCHECK(thread_checker_.CalledOnValidThread());
   encoder_ready_ = true;
   key_frame_request_ = true;
   ScheduleNextFrame(base::TimeTicks::Now());
 }
 
 void WebrtcFrameSchedulerSimple::OnChannelParameters(int packet_loss,
                                                      base::TimeDelta rtt) {
@@ skipping 163 matching lines @@
 void WebrtcFrameSchedulerSimple::CaptureNextFrame() {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(!frame_pending_);
   last_capture_started_time_ = base::TimeTicks::Now();
   frame_pending_ = true;
   capture_callback_.Run();
 }
 
 }  // namespace protocol
 }  // namespace remoting