[WebMIDI] Introduce UsbMidi{Input, Output}Stream.

media/midi/midi_message_util.h

Index: media/midi/midi_message_util.h
diff --git a/media/midi/midi_message_util.h b/media/midi/midi_message_util.h
index 1dc6d3cba786df4687e7c358a86d22acb8966da0..4111637f21f440bc162ae603a1b72a986b0993e4 100644
--- a/media/midi/midi_message_util.h
+++ b/media/midi/midi_message_util.h
@@ -20,6 +20,10 @@ namespace media {
 // - the End of System Exclusive message.
 MEDIA_EXPORT size_t GetMIDIMessageLength(uint8 status_byte);
 
+const uint8 kSystemExclusiveByte = 0xf0;
+const uint8 kSystemExclusiveEndByte = 0xf7;
+const uint8 kSystemMessagePattern = 0xf0;

[Takashi Toyoshima, 2014/01/15 12:08:40]

Can you insert one line after the line 24, and how about renaming and adding
like this.

kMessageTypeMask = 0xf0;
kSystemMessageType = 0xf0;

[yhirano, 2014/01/15 13:25:42]

Done.

+
 }  // namespace media
 
 #endif  // MEDIA_MIDI_MIDI_MESSAGE_UTIL_H_