Web MIDI: add dynamic MidiManager instantiation support for Linux

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 31f3104c6251aa6187dc9b1878cf25621641bfe1..743c23e8169b26391e037ca5b9384c469a972b89 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -2199,6 +2199,10 @@ const FeatureEntry kFeatureEntries[] = {
      IDS_FLAGS_AIA_FETCHING_DESCRIPTION, kOsAndroid,
      FEATURE_VALUE_TYPE(net::CertVerifyProcAndroid::kAIAFetchingFeature)},
 #endif
+    {"enable-midi-manager-dynamic-instantiation",
+     IDS_FLAGS_ENABLE_MIDI_MANAGER_DYNAMIC_INSTANTIATION_NAME,
+     IDS_FLAGS_ENABLE_MIDI_MANAGER_DYNAMIC_INSTANTIATION_DESCRIPTION, kOsAll,
+     FEATURE_VALUE_TYPE(midi::features::kMidiManagerDynamicInstantiation)}
 
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms.xml. See note in