Introduce the Blink NotificationService, move permission checks there

content/browser/notifications/blink_notification_service_impl.cc

+// Copyright 2016 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 "content/browser/notifications/blink_notification_service_impl.h"
+
+#include "base/logging.h"
+#include "content/browser/notifications/platform_notification_context_impl.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/content_browser_client.h"
+#include "content/public/browser/platform_notification_service.h"
+#include "content/public/common/content_client.h"
+#include "third_party/WebKit/public/platform/modules/permissions/permission_status.mojom.h"
+#include "url/gurl.h"
+
+namespace content {
+
+namespace {
+
+// Returns the implementation of the PlatformNotificationService. May be NULL.
+PlatformNotificationService* Service() {
+  return GetContentClient()->browser()->GetPlatformNotificationService();
+}
+
+}  // namespace
+
+BlinkNotificationServiceImpl::BlinkNotificationServiceImpl(
+    PlatformNotificationContextImpl* notification_context,
+    ResourceContext* resource_context,
+    int render_process_id,
+    mojo::InterfaceRequest<blink::mojom::NotificationService> request)
+    : notification_context_(notification_context),
+      resource_context_(resource_context),
+      render_process_id_(render_process_id),
+      binding_(this, std::move(request)) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK(notification_context_);
+  DCHECK(resource_context_);
+
+  binding_.set_connection_error_handler(
+      base::Bind(&BlinkNotificationServiceImpl::OnConnectionError,
+                 base::Unretained(this) /* the channel is owned by this */));
+}
+
+BlinkNotificationServiceImpl::~BlinkNotificationServiceImpl() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+}
+
+void BlinkNotificationServiceImpl::GetPermissionStatus(
+    const mojo::String& origin,
+    const GetPermissionStatusCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  if (!Service()) {
+    callback.Run(blink::mojom::PermissionStatus::DENIED);
+    return;
+  }
+
+  blink::mojom::PermissionStatus permission_status =
+      Service()->CheckPermissionOnIOThread(
+          resource_context_, GURL(origin.get()), render_process_id_);
+
+  callback.Run(permission_status);
+}
+
+void BlinkNotificationServiceImpl::OnConnectionError() {
+  notification_context_->RemoveService(this);
+  // |this| has now been deleted.
+}
+
+}  // namespace content