Web MIDI: call AccumulateMidiBytesSent() after operation finished

media/midi/midi_manager.cc

Index: media/midi/midi_manager.cc
diff --git a/media/midi/midi_manager.cc b/media/midi/midi_manager.cc
index f7de36f2ac50d2a73c8d63a65129806b6d17ba23..183988e04ae274832c264545bcba20a8b88319ce 100644
--- a/media/midi/midi_manager.cc
+++ b/media/midi/midi_manager.cc
@@ -94,6 +94,15 @@ void MidiManager::EndSession(MidiManagerClient* client) {
   pending_clients_.erase(client);
 }
 
+void MidiManager::AccumulateMidiBytesSent(MidiManagerClient* client, size_t n) {
+  {
+    base::AutoLock auto_lock(lock_);
+    if (clients_.find(client) == clients_.end())
+      return;
+  }
+  client->AccumulateMidiBytesSent(n);
+}
+
 void MidiManager::DispatchSendMidiData(MidiManagerClient* client,
                                        uint32 port_index,
                                        const std::vector<uint8>& data,