[WebMIDI] Introduce MidiManagerUsb

media/midi/usb_midi_input_stream.cc

 // Copyright 2014 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 "media/midi/usb_midi_input_stream.h"
 
 #include <string.h>
 #include <map>
 #include <vector>
 
@@ skipping 71 matching lines @@
     return;
   }
   std::map<JackUniqueKey, size_t>::const_iterator it =
       jack_dictionary_.find(JackUniqueKey(device,
                                           endpoint_number,
                                           cable_number));
   if (it != jack_dictionary_.end())
     delegate_->OnReceivedData(it->second, &packet[1], packet_size, timestamp);
 }
 
+std::vector<UsbMidiInputStream::JackUniqueKey>
+UsbMidiInputStream::RegisteredJackKeysForTesting() const {
+  std::vector<JackUniqueKey> result(jack_dictionary_.size(),
+                                    JackUniqueKey(0, 0, 0));
+  for (std::map<JackUniqueKey, size_t>::const_iterator it =
+           jack_dictionary_.begin();
+       it != jack_dictionary_.end(); ++it) {
+    DCHECK_LT(it->second, result.size());
+    result[it->second] = it->first;
+  }
+  return result;
+}
+
 }  // namespace media