Update VirtualSocketServer locking to match documentation.

Add GUARDED_BY annotation on members claimed to be protected by the
lock, and add missing lock operations. Also mark a few members const.

Bug: webrtc:11567, webrtc:2079
Change-Id: I8f12ca7627df0c24e07fa2ae24a387c6a0ed76cf
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/208224
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34340}
diff --git a/rtc_base/virtual_socket_server.h b/rtc_base/virtual_socket_server.h
index faf31f0..a17a6d6 100644
--- a/rtc_base/virtual_socket_server.h
+++ b/rtc_base/virtual_socket_server.h
@@ -400,16 +400,16 @@
 
   void OnSocketServerReadyToSend();
 
-  VirtualSocketServer* server_;
-  int type_;
-  bool async_;
+  VirtualSocketServer* const server_;
+  const int type_;
+  const bool async_;
   ConnState state_;
   int error_;
   SocketAddress local_addr_;
   SocketAddress remote_addr_;
 
   // Pending sockets which can be Accepted
-  ListenQueue* listen_queue_;
+  ListenQueue* listen_queue_ RTC_GUARDED_BY(crit_) RTC_PT_GUARDED_BY(crit_);
 
   // Data which tcp has buffered for sending
   SendBuffer send_buffer_;
@@ -417,7 +417,7 @@
   // Set back to true when the socket can send again.
   bool ready_to_send_ = true;
 
-  // Critical section to protect the recv_buffer and queue_
+  // Critical section to protect the recv_buffer and listen_queue_
   RecursiveCriticalSection crit_;
 
   // Network model that enforces bandwidth and capacity constraints
@@ -428,7 +428,7 @@
   int64_t last_delivery_time_ = 0;
 
   // Data which has been received from the network
-  RecvBuffer recv_buffer_;
+  RecvBuffer recv_buffer_ RTC_GUARDED_BY(crit_);
   // The amount of data which is in flight or in recv_buffer_
   size_t recv_buffer_size_;