renderer: implement multiple permission requesting

content/browser/permissions/permission_pending_single_request.h

Index: content/browser/permissions/permission_pending_single_request.h
diff --git a/content/browser/permissions/permission_pending_single_request.h b/content/browser/permissions/permission_pending_single_request.h
new file mode 100644
index 0000000000000000000000000000000000000000..74654e8f4daca43c26007abf2fc28e581a43430f
--- /dev/null
+++ b/content/browser/permissions/permission_pending_single_request.h
@@ -0,0 +1,44 @@
+// 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_SINGLE_REQUEST_H_
+#define CONTENT_BROWSER_PERMISSIONS_PERMISSION_PENDING_SINGLE_REQUEST_H_
+
+#include "base/callback_forward.h"
+#include "base/macros.h"
+#include "content/browser/permissions/permission_pending_request.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 PermissionPendingSingleRequest : public PermissionPendingRequest {
+ public:
+  using PermissionStatusCallback = mojo::Callback<void(PermissionStatus)>;
+
+  PermissionPendingSingleRequest(
+      PermissionType permission,
+      const GURL& origin,
+      const PermissionStatusCallback& callback);
+  ~PermissionPendingSingleRequest() override;
+
+  void Cancel(PermissionManager* permission_manager,
+              RenderFrameHost* context,
+              int request_id) override;
+
+  PermissionStatusCallback callback;
+
+ private:
+  PermissionType permission;
+  GURL origin;
+
+ DISALLOW_COPY_AND_ASSIGN(PermissionPendingSingleRequest);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_PERMISSIONS_PERMISSION_PENDING_SINGLE_REQUEST_H_