Consistently lock RTCVideoDecoder::state_.

content/renderer/media/gpu/rtc_video_decoder.cc

 // Copyright 2013 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 "content/renderer/media/gpu/rtc_video_decoder.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 654 matching lines @@
 }
 
 void RTCVideoDecoder::ResetInternal() {
   DVLOG(2) << __func__;
   DCheckGpuVideoAcceleratorFactoriesTaskRunnerIsCurrent();
 
   if (vda_) {
     vda_->Reset();
   } else {
     CreateVDA(vda_codec_profile_, nullptr);
-    if (vda_)
+    if (vda_) {
+      base::AutoLock auto_lock(lock_);
       state_ = INITIALIZED;
+    }
   }
 }
 
 // static
 void RTCVideoDecoder::ReleaseMailbox(
     base::WeakPtr<RTCVideoDecoder> decoder,
     media::GpuVideoAcceleratorFactories* factories,
     int64_t picture_buffer_id,
     uint32_t texture_id,
     const gpu::SyncToken& release_sync_token) {
@@ skipping 199 matching lines @@
 }
 
 void RTCVideoDecoder::ClearPendingBuffers() {
   // Delete WebRTC input buffers.
   for (const auto& pending_buffer : pending_buffers_)
     delete[] pending_buffer.first._buffer;
   pending_buffers_.clear();
 }
 
 }  // namespace content