Add a PermissionContext subclass for the midi permission

chrome/browser/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 559 matching lines @@
     "media/media_engagement_contents_observer.cc",
     "media/media_engagement_contents_observer.h",
     "media/media_engagement_service.cc",
     "media/media_engagement_service.h",
     "media/media_engagement_service_factory.cc",
     "media/media_engagement_service_factory.h",
     "media/media_url_constants.cc",
     "media/media_url_constants.h",
     "media/midi_permission_context.cc",
     "media/midi_permission_context.h",
+    "media/midi_sysex_permission_context.cc",
+    "media/midi_sysex_permission_context.h",
     "media/output_protection_proxy.cc",
     "media/output_protection_proxy.h",
     "media/router/media_router_feature.cc",
     "media/router/media_router_feature.h",
     "media/webrtc/desktop_media_list.h",
     "media/webrtc/desktop_media_list_base.cc",
     "media/webrtc/desktop_media_list_base.h",
     "media/webrtc/desktop_media_picker.h",
     "media/webrtc/desktop_streams_registry.cc",
     "media/webrtc/desktop_streams_registry.h",
@@ skipping 4185 matching lines @@
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }
 
 service_manifest("preferences_forwarder_manifest") {
   name = "preferences_forwarder"
   source = "prefs/forwarder_manifest.json"
 }