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

media/midi/midi_switches.cc

Index: media/midi/midi_switches.cc
diff --git a/components/web_resource/web_resource_switches.cc b/media/midi/midi_switches.cc
similarity index 56%
copy from components/web_resource/web_resource_switches.cc
copy to media/midi/midi_switches.cc
index 8a1f9a772c0997b747f3dadfd6ffdcac8bbc2cff..1fee12ce92da3472add97d91cb672f5627e2de11 100644
--- a/components/web_resource/web_resource_switches.cc
+++ b/media/midi/midi_switches.cc
@@ -2,11 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "components/web_resource/web_resource_switches.h"
+#include "media/midi/midi_switches.h"
 
 namespace switches {
 
-// Specifies a custom URL for fetching NTP promo data.
-const char kPromoServerURL[] = "promo-server-url";
+#if defined(OS_ANDROID)
+// Use Android Midi API for WebMIDI
+const char kUseAndroidMidiApi[] = "use-android-midi-api";
+#endif
 
 }  // namespace switches