[Web MIDI] Use Android MIDI API.

media/midi/midi_input_port_android.h

+// Copyright 2015 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.
+
+#ifndef MEDIA_MIDI_MIDI_INPUT_PORT_ANDROID_H_
+#define MEDIA_MIDI_MIDI_INPUT_PORT_ANDROID_H_
+
+#include <jni.h>
+
+#include "base/android/scoped_java_ref.h"
+#include "base/time/time.h"
+
+namespace media {
+namespace midi {
+
+class MidiInputPortAndroid final {
+ public:
+  class Delegate {
+   public:
+    virtual ~Delegate() {}
+    virtual void OnReceivedData(MidiInputPortAndroid* port,
+                                const uint8* data,
+                                size_t size,
+                                base::TimeTicks time) = 0;
+  };
+  MidiInputPortAndroid(JNIEnv* env, jobject raw, Delegate* delegate);
+  ~MidiInputPortAndroid();
+
+  // Returns true when the operation succeeds.
+  bool Open();
+  void Close();
+
+  // Called by the Java world.
+  void OnData(JNIEnv* env,
+              jobject caller,
+              jbyteArray data,
+              jint offset,
+              jint size,
+              jlong timestamp);
+
+  static bool Register(JNIEnv* env);
+
+ private:
+  base::android::ScopedJavaGlobalRef<jobject> raw_port_;
+  Delegate* const delegate_;
+};
+
+}  // namespace midi
+}  // namespace media
+
+#endif  // MEDIA_MIDI_MIDI_INPUT_PORT_ANDROID_H_