renderer: implement multiple permission requesting

content/browser/permissions/permission_pending_request.h

+// 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.
+
+#ifndef CONTENT_BROWSER_PERMISSIONS_PERMISSION_PENDING_REQUEST_H_
+#define CONTENT_BROWSER_PERMISSIONS_PERMISSION_PENDING_REQUEST_H_
+
+#include "base/callback_forward.h"
+#include "base/macros.h"
+#include "content/common/permission_service.mojom.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/binding.h"
+#include "url/gurl.h"
+
+namespace content {
+
+enum class PermissionType;
+
+class PermissionPendingRequest {
+ public:
+  using PermissionRequestCallback =
+      mojo::Callback<void(mojo::Array<PermissionStatus>)>;
+
+  PermissionPendingRequest(PermissionRequestCallback callback,
+                           int request_count);
+  ~PermissionPendingRequest();
+
+  PermissionRequestCallback& callback() { return callback_; }
+
+ private:
+  PermissionRequestCallback callback_;
+  int request_count_;
+
+ DISALLOW_COPY_AND_ASSIGN(PermissionPendingRequest);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_PERMISSIONS_PERMISSION_PENDING_REQUEST_H_