Fix DTLS packet boundary handling in SSLStreamAdapterTests.

webrtc/base/bufferqueue.cc

 /*
  *  Copyright 2015 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 20 matching lines @@
   CritScope cs(&crit_);
   return queue_.size();
 }
 
 bool BufferQueue::ReadFront(void* buffer, size_t bytes, size_t* bytes_read) {
   CritScope cs(&crit_);
   if (queue_.empty()) {
     return false;
   }
 
+  bool was_writable = queue_.size() < capacity_;
   Buffer* packet = queue_.front();
   queue_.pop_front();
 
-  size_t next_packet_size = packet->size();
-  if (bytes > next_packet_size) {
-    bytes = next_packet_size;
-  }
-
+  bytes = std::min(bytes, packet->size());
   memcpy(buffer, packet->data(), bytes);
   if (bytes_read) {
     *bytes_read = bytes;
   }
   free_list_.push_back(packet);
+  if (!was_writable) {
+    NotifyWritableForTest();
+  }
   return true;
 }
 
 bool BufferQueue::WriteBack(const void* buffer, size_t bytes,
                             size_t* bytes_written) {
   CritScope cs(&crit_);
   if (queue_.size() == capacity_) {
     return false;
   }
 
+  bool was_readable = !queue_.empty();
   Buffer* packet;
   if (!free_list_.empty()) {
     packet = free_list_.back();
     free_list_.pop_back();
   } else {
     packet = new Buffer(bytes, default_size_);
   }
 
   packet->SetData(static_cast<const uint8_t*>(buffer), bytes);
   if (bytes_written) {
     *bytes_written = bytes;
   }
   queue_.push_back(packet);
+  if (!was_readable) {
+    NotifyReadableForTest();
+  }
   return true;
 }
 
 }  // namespace rtc