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

chrome/browser/about_flags.cc

 // Copyright (c) 2012 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 "chrome/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 2119 matching lines @@
      // merge the flag values.
      SINGLE_VALUE_TYPE_AND_VALUE(
          switches::kBlinkSettings, "lowPriorityIframes=true")},
 #if defined(OS_ANDROID)
     {"enable-ntp-popular-sites",
      IDS_FLAGS_NTP_POPULAR_SITES_NAME,
      IDS_FLAGS_NTP_POPULAR_SITES_DESCRIPTION,
      kOsAndroid,
      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableNTPPopularSites,
                                switches::kDisableNTPPopularSites)},
+    {"use-android-midi-api",
+     IDS_FLAGS_USE_ANDROID_MIDI_API_NAME,
+     IDS_FLAGS_USE_ANDROID_MIDI_API_DESCRIPTION,
+     kOsAndroid,
+     SINGLE_VALUE_TYPE(switches::kUseAndroidMidiApi)},
 #endif  // defined(OS_ANDROID)
 #if defined(OS_WIN)
      {"trace-export-events-to-etw",
       IDS_FLAGS_TRACE_EXPORT_EVENTS_TO_ETW_NAME,
       IDS_FLAGS_TRACE_EXPORT_EVENTS_TO_ETW_DESRIPTION,
       kOsWin,
       SINGLE_VALUE_TYPE(switches::kTraceExportEventsToETW)},
 #endif  // defined(OS_WIN)
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
@@ skipping 630 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags