MidiManagerWinrt as base::FeatureList feature

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index cb3745cb2168635e5d8cf235f71d6237910b822a..ad7c1a5a67534ebacdeaaa8529e4c5f4579acc76 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -86487,6 +86487,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="-918900957" label="AutofillCreditCardAssist:disabled"/>
   <int value="-918618075" label="enable-service-worker"/>
   <int value="-914210146" label="enable-web-based-signin"/>
+  <int value="-912456561" label="MidiManagerWinrt:enabled"/>
   <int value="-908421850" label="PointerEvent:enabled"/>
   <int value="-907234795" label="NewAudioRenderingMixingStrategy:disabled"/>
   <int value="-899334103" label="disable-fast-text-autosizing"/>
@@ -86608,6 +86609,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="-277144896" label="enable-viewport-meta"/>
   <int value="-268357961" label="enable-feature-policy"/>
   <int value="-254887599" label="google-profile-info"/>
+  <int value="-241353344" label="MidiManagerWinrt:disabled"/>
   <int value="-234966279" label="PointerEvent:disabled"/>
   <int value="-234687894"
       label="NonValidatingReloadOnRefreshContentV2:disabled"/>