[WebMIDI] Add "use-android-midi-api" flag for Android M+ devices.

media/midi/midi_manager.h

Index: media/midi/midi_manager.h
diff --git a/media/midi/midi_manager.h b/media/midi/midi_manager.h
index 957c84d427f0dc85b291cd6b9cee188067dca5d7..c08c638b07e606e030b79c002b56f80b5ceb1f1c 100644
--- a/media/midi/midi_manager.h
+++ b/media/midi/midi_manager.h
@@ -68,12 +68,25 @@ class MIDI_EXPORT MidiManager {
  public:
   static const size_t kMaxPendingClientCount = 128;
 
+  class CreationOptions {
+   public:
+#if defined(OS_ANDROID)
+    bool use_native_midi_api() const { return use_native_midi_api_; }
+    void set_use_native_midi_api(bool b) { use_native_midi_api_ = b; }
+#endif // defined(OS_ANDROID)
+
+   private:
+#if defined(OS_ANDROID)
+    bool use_native_midi_api_ = false;
+#endif // defined(OS_ANDROID)
+  };
+
   MidiManager();
   virtual ~MidiManager();
 
   // The constructor and the destructor will be called on the CrBrowserMain
   // thread.
-  static MidiManager* Create();
+  static MidiManager* Create(const CreationOptions&);
 
   // A client calls StartSession() to receive and send MIDI data.
   // If the session is ready to start, the MIDI system is lazily initialized