Added full screen flex column

Summary: The original flex colum that came as standard did not flex to fill the remainder of the screen. Adding this component allows for a full screen flex column so that the scroll bar in the timeline looks correct.

Reviewed By: jknoxville

Differential Revision: D16416933

fbshipit-source-id: bd296aea85730f192778ed0aca4b226893b2829d

src/plugins/navigation/components/ScrollableFlexColumn.js

@@ -0,0 +1,13 @@
+/**
+ * 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
+ * @flow strict-local
+ */
+
+import {FlexColumn, styled} from 'flipper';
+
+export default styled(FlexColumn)({
+  height: '100%',
+});

src/plugins/navigation/components/index.js

@@ -8,4 +8,5 @@
 
 export {default as IconButton} from './IconButton';
 export {default as NavigationInfoBox} from './NavigationInfoBox';
+export {default as ScrollableFlexColumn} from './ScrollableFlexColumn';
 export {default as SearchBar} from './SearchBar';