Add voice broadcast seek 30s forward/backward buttons (#9592)

src/voice-broadcast/components/atoms/SeekButton.tsx

@@ -0,0 +1,39 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from "react";
+
+import AccessibleButton from "../../../components/views/elements/AccessibleButton";
+
+interface Props {
+    icon: React.FC<React.SVGProps<SVGSVGElement>>;
+    label: string;
+    onClick: () => void;
+}
+
+export const SeekButton: React.FC<Props> = ({
+    onClick,
+    icon: Icon,
+    label,
+}) => {
+    return <AccessibleButton
+        kind="secondary_content"
+        onClick={onClick}
+        aria-label={label}
+    >
+        <Icon className="mx_Icon mx_Icon_24" />
+    </AccessibleButton>;
+};