1 files changed, 15 insertions, 3 deletions
diff --git a/third_party/libwebrtc/pc/dtls_transport.h b/third_party/libwebrtc/pc/dtls_transport.h
index cca4cc980a..a1893297e6 100644
--- a/third_party/libwebrtc/pc/dtls_transport.h
+++ b/third_party/libwebrtc/pc/dtls_transport.h
@@ -12,6 +12,7 @@
 #define PC_DTLS_TRANSPORT_H_
 
 #include <memory>
+#include <utility>
 
 #include "api/dtls_transport_interface.h"
 #include "api/ice_transport_interface.h"
@@ -40,18 +41,22 @@ class DtlsTransport : public DtlsTransportInterface {
       std::unique_ptr<cricket::DtlsTransportInternal> internal);
 
   rtc::scoped_refptr<IceTransportInterface> ice_transport() override;
+
+  // Currently called from the signaling thread and potentially Chromium's
+  // JS thread.
   DtlsTransportInformation Information() override;
+
   void RegisterObserver(DtlsTransportObserverInterface* observer) override;
   void UnregisterObserver() override;
   void Clear();
 
   cricket::DtlsTransportInternal* internal() {
-    MutexLock lock(&lock_);
+    RTC_DCHECK_RUN_ON(owner_thread_);
     return internal_dtls_transport_.get();
   }
 
   const cricket::DtlsTransportInternal* internal() const {
-    MutexLock lock(&lock_);
+    RTC_DCHECK_RUN_ON(owner_thread_);
     return internal_dtls_transport_.get();
   }
 
@@ -63,12 +68,19 @@ class DtlsTransport : public DtlsTransportInterface {
                            DtlsTransportState state);
   void UpdateInformation();
 
+  // Called when changing `info_`. We only change the values from the
+  // `owner_thread_` (a.k.a. the network thread).
+  void set_info(DtlsTransportInformation&& info) RTC_RUN_ON(owner_thread_) {
+    MutexLock lock(&lock_);
+    info_ = std::move(info);
+  }
+
   DtlsTransportObserverInterface* observer_ = nullptr;
   rtc::Thread* owner_thread_;
   mutable Mutex lock_;
   DtlsTransportInformation info_ RTC_GUARDED_BY(lock_);
   std::unique_ptr<cricket::DtlsTransportInternal> internal_dtls_transport_
-      RTC_GUARDED_BY(lock_);
+      RTC_GUARDED_BY(owner_thread_);
   const rtc::scoped_refptr<IceTransportWithPointer> ice_transport_;
 };