Move handler processing to NotificationDisplayService.

chrome/browser/notifications/notification_display_service.cc

+// 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/notifications/notification_display_service.h"
+
+#include "base/memory/ptr_util.h"
+#include "base/strings/nullable_string16.h"
+#include "chrome/browser/notifications/non_persistent_notification_handler.h"
+#include "chrome/browser/notifications/notification_common.h"
+#include "chrome/browser/notifications/persistent_notification_handler.h"
+#include "extensions/features/features.h"
+
+#if BUILDFLAG(ENABLE_EXTENSIONS)
+#include "chrome/browser/extensions/api/notifications/extension_notification_handler.h"
+#endif
+
+NotificationDisplayService::NotificationDisplayService(Profile* profile)
+    : profile_(profile) {
+  AddNotificationHandler(NotificationCommon::NON_PERSISTENT,
+                         base::MakeUnique<NonPersistentNotificationHandler>());
+  AddNotificationHandler(NotificationCommon::PERSISTENT,
+                         base::MakeUnique<PersistentNotificationHandler>());
+#if BUILDFLAG(ENABLE_EXTENSIONS)
+  AddNotificationHandler(
+      NotificationCommon::EXTENSION,
+      base::MakeUnique<extensions::ExtensionNotificationHandler>());
+#endif
+}
+
+NotificationDisplayService::~NotificationDisplayService() = default;
+
+void NotificationDisplayService::AddNotificationHandler(
+    NotificationCommon::Type notification_type,
+    std::unique_ptr<NotificationHandler> handler) {
+  DCHECK(handler);
+  DCHECK_EQ(notification_handlers_.count(notification_type), 0u);
+  notification_handlers_[notification_type] = std::move(handler);
+}
+
+NotificationHandler* NotificationDisplayService::GetNotificationHandler(
+    NotificationCommon::Type notification_type) {
+  DCHECK(notification_handlers_.find(notification_type) !=
+         notification_handlers_.end())
+      << notification_type << " is not registered.";
+  return notification_handlers_[notification_type].get();
+}
+
+void NotificationDisplayService::ProcessNotificationOperation(
+    NotificationCommon::Operation operation,
+    NotificationCommon::Type notification_type,
+    const std::string& origin,
+    const std::string& notification_id,
+    int action_index,
+    const base::NullableString16& reply) {
+  NotificationHandler* handler = GetNotificationHandler(notification_type);
+  CHECK(handler);

[Peter Beverloo, 2017/06/01 11:32:45]

Random thought: should we crash the browser if we can invalid data from the OS?
A return w/ a LOG(ERROR) may be kinder.

[Miguel Garcia, 2017/06/02 15:02:55]

Ok moved it to a DCHECK with nice LOG(ERROR) +  return for release builds

+  switch (operation) {
+    case NotificationCommon::CLICK:
+      handler->OnClick(profile_, origin, notification_id, action_index, reply);
+      break;
+    case NotificationCommon::CLOSE:
+      handler->OnClose(profile_, origin, notification_id, true /* by_user */);
+      break;
+    case NotificationCommon::SETTINGS:
+      handler->OpenSettings(profile_);
+      break;
+  }
+}