Run export flipper trace in background

Summary: Adds the capability to run the export in the background along with the display of the status in the title bar.

Reviewed By: danielbuechele

Differential Revision: D16567026

fbshipit-source-id: 3955243cd7f094a7ee33eef3511804ff6e6476be

src/chrome/CancellableExportStatus.js

@@ -0,0 +1,37 @@
+/**
+ * Copyright 2018-present Facebook.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ * @format
+ */
+
+import {FlexRow, Button} from '../ui/index';
+import {styled, LoadingIndicator, Text} from 'flipper';
+import {Component} from 'react';
+import {colors} from '../ui/components/colors';
+
+const Wrapper = styled(FlexRow)({
+  color: colors.light50,
+  alignItems: 'center',
+  marginLeft: 10,
+});
+
+type Props = {
+  msg: string,
+  onCancel: void => void,
+};
+
+export default class CancellableExportStatus extends Component<Props> {
+  render() {
+    const {msg, onCancel} = this.props;
+    return (
+      <Wrapper>
+        <LoadingIndicator size={16} />
+        &nbsp;
+        <Text>{msg}</Text>
+        &nbsp;
+        <Button onClick={onCancel}> Cancel </Button>
+      </Wrapper>
+    );
+  }
+}