Revert of Remove content::NotificationPermissionDispatcher.

content/renderer/notification_permission_dispatcher.cc

+// Copyright 2014 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/renderer/notification_permission_dispatcher.h"
+
+#include <utility>
+
+#include "base/bind.h"
+#include "content/public/renderer/render_frame.h"
+#include "services/shell/public/cpp/interface_provider.h"
+#include "third_party/WebKit/public/platform/WebSecurityOrigin.h"
+#include "third_party/WebKit/public/platform/WebString.h"
+#include "third_party/WebKit/public/platform/modules/permissions/permission_status.mojom.h"
+#include "third_party/WebKit/public/web/WebUserGestureIndicator.h"
+#include "third_party/WebKit/public/web/modules/notifications/WebNotificationPermissionCallback.h"
+
+using blink::WebNotificationPermissionCallback;
+
+namespace content {
+
+NotificationPermissionDispatcher::NotificationPermissionDispatcher(
+    RenderFrame* render_frame)
+    : RenderFrameObserver(render_frame) {}
+
+NotificationPermissionDispatcher::~NotificationPermissionDispatcher() {}
+
+void NotificationPermissionDispatcher::RequestPermission(
+    const blink::WebSecurityOrigin& origin,
+    WebNotificationPermissionCallback* callback) {
+  if (!permission_service_.get()) {
+    render_frame()->GetRemoteInterfaces()->GetInterface(&permission_service_);
+  }
+
+  std::unique_ptr<WebNotificationPermissionCallback> owned_callback(callback);
+
+  // base::Unretained is safe here because the Mojo channel, with associated
+  // callbacks, will be deleted before the "this" instance is deleted.
+  permission_service_->RequestPermission(
+      blink::mojom::PermissionName::NOTIFICATIONS, origin,
+      blink::WebUserGestureIndicator::isProcessingUserGesture(),
+      base::Bind(&NotificationPermissionDispatcher::OnPermissionRequestComplete,
+                 base::Unretained(this),
+                 base::Passed(std::move(owned_callback))));
+}
+
+void NotificationPermissionDispatcher::OnPermissionRequestComplete(
+    std::unique_ptr<WebNotificationPermissionCallback> callback,
+    blink::mojom::PermissionStatus status) {
+  DCHECK(callback);
+
+  // Blink can't use non-blink bindings so we need to cast to int32.
+  int32_t blink_status = static_cast<int32_t>(status);
+
+  callback->permissionRequestComplete(blink_status);
+}
+
+void NotificationPermissionDispatcher::OnDestruct() {
+  delete this;
+}
+
+}  // namespace content