Implement PermissionService::GetNextPermissionChange.

chrome/browser/content_settings/permission_observer_factory.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_observer_factory.h"
+
+#include "chrome/browser/content_settings/permission_observer.h"
+#include "chrome/browser/profiles/incognito_helpers.h"
+#include "chrome/browser/profiles/profile.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+
+// static
+PermissionObserver*
+PermissionObserverFactory::GetForProfile(Profile* profile) {
+  return static_cast<PermissionObserver*>(
+      GetInstance()->GetServiceForBrowserContext(profile, true));
+}
+
+// static
+PermissionObserverFactory* PermissionObserverFactory::GetInstance() {
+  return Singleton<PermissionObserverFactory>::get();
+}
+
+PermissionObserverFactory::PermissionObserverFactory()
+    : BrowserContextKeyedServiceFactory(
+        "PermissionObserverFactory",
+        BrowserContextDependencyManager::GetInstance()) {

[Bernhard Bauer, 2015/03/11 14:06:18]

You need to declare your dependencies on other keyed services here.

[mlamouri (slow - plz ping), 2015/03/18 16:24:40]

I exposed a way to get the PermissionContext related factories in order to setup
the dependencies. Hopefully, it's not too ugly.

+}
+
+PermissionObserverFactory::~PermissionObserverFactory() {
+}
+
+KeyedService* PermissionObserverFactory::BuildServiceInstanceFor(
+    content::BrowserContext* context) const {
+  return new PermissionObserver(Profile::FromBrowserContext(context));
+}
+
+content::BrowserContext*
+PermissionObserverFactory::GetBrowserContextToUse(
+    content::BrowserContext* context) const {
+  return chrome::GetBrowserContextOwnInstanceInIncognito(context);
+}