Implement PermissionService::GetNextPermissionChange.

chrome/browser/content_settings/permission_context.cc

+// Copyright 2015 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/content_settings/permission_context.h"
+
+#include "chrome/browser/geolocation/geolocation_permission_context.h"
+#include "chrome/browser/geolocation/geolocation_permission_context_factory.h"
+#include "chrome/browser/media/midi_permission_context.h"
+#include "chrome/browser/media/midi_permission_context_factory.h"
+#include "chrome/browser/notifications/desktop_notification_service.h"
+#include "chrome/browser/notifications/desktop_notification_service_factory.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/push_messaging/push_messaging_permission_context.h"
+#include "chrome/browser/push_messaging/push_messaging_permission_context_factory.h"
+
+#if defined(OS_ANDROID) || defined(OS_CHROMEOS)
+#include "chrome/browser/media/protected_media_identifier_permission_context.h"
+#include "chrome/browser/media/protected_media_identifier_permission_context_factory.h"
+#endif
+
+namespace PermissionContext {
+
+PermissionContextBase* Get(Profile* profile,
+                           ContentSettingsType content_settings_type) {
+  switch (content_settings_type) {
+    case CONTENT_SETTINGS_TYPE_GEOLOCATION:
+      return GeolocationPermissionContextFactory::GetForProfile(profile);
+    case CONTENT_SETTINGS_TYPE_NOTIFICATIONS:
+      return DesktopNotificationServiceFactory::GetForProfile(profile);
+    case CONTENT_SETTINGS_TYPE_MIDI_SYSEX:
+      return MidiPermissionContextFactory::GetForProfile(profile);
+#if defined(OS_ANDROID) || defined(OS_CHROMEOS)
+    case CONTENT_SETTINGS_TYPE_PROTECTED_MEDIA_IDENTIFIER:
+      return ProtectedMediaIdentifierPermissionContextFactory::GetForProfile(
+          profile);
+#endif
+    case CONTENT_SETTINGS_TYPE_PUSH_MESSAGING:
+      return PushMessagingPermissionContextFactory::GetForProfile(profile);
+    default:
+      NOTREACHED() << "No PermissionContext associated with "
+                   << content_settings_type;
+      break;
+  }
+
+  return nullptr;
+}
+
+}  // namespace PermissionContext