Add a PermissionContext subclass for the midi permission

chrome/browser/media/midi_sysex_permission_context.cc

Index: chrome/browser/media/midi_sysex_permission_context.cc
diff --git a/chrome/browser/media/midi_sysex_permission_context.cc b/chrome/browser/media/midi_sysex_permission_context.cc
new file mode 100644
index 0000000000000000000000000000000000000000..689e141a5fbf3349144b5ebf4e530a2a91a619b3
--- /dev/null
+++ b/chrome/browser/media/midi_sysex_permission_context.cc
@@ -0,0 +1,38 @@
+// Copyright 2017 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/media/midi_sysex_permission_context.h"
+
+#include "chrome/browser/content_settings/tab_specific_content_settings.h"
+#include "chrome/browser/permissions/permission_request_id.h"
+#include "content/public/browser/child_process_security_policy.h"
+#include "url/gurl.h"
+
+MidiSysexPermissionContext::MidiSysexPermissionContext(Profile* profile)
+    : PermissionContextBase(profile, CONTENT_SETTINGS_TYPE_MIDI_SYSEX) {}
+
+MidiSysexPermissionContext::~MidiSysexPermissionContext() {}
+
+void MidiSysexPermissionContext::UpdateTabContext(const PermissionRequestID& id,
+                                                  const GURL& requesting_frame,
+                                                  bool allowed) {
+  TabSpecificContentSettings* content_settings =
+      TabSpecificContentSettings::GetForFrame(id.render_process_id(),
+                                              id.render_frame_id());
+  if (!content_settings)
+    return;
+
+  if (allowed) {
+    content_settings->OnMidiSysExAccessed(requesting_frame);
+
+    content::ChildProcessSecurityPolicy::GetInstance()
+        ->GrantSendMidiSysExMessage(id.render_process_id());
+  } else {
+    content_settings->OnMidiSysExAccessBlocked(requesting_frame);
+  }
+}
+
+bool MidiSysexPermissionContext::IsRestrictedToSecureOrigins() const {
+  return true;
+}