Add account media gallery view to web UI (#3120)

* Add account media gallery view to web UI

* Link media view from account dropdown

* Adjust link

app/javascript/mastodon/features/account_gallery/components/media_item.js

@@ -0,0 +1,39 @@
+import React from 'react';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import ImmutablePureComponent from 'react-immutable-pure-component';
+import Permalink from '../../../components/permalink';
+
+class MediaItem extends ImmutablePureComponent {
+
+  static propTypes = {
+    media: ImmutablePropTypes.map.isRequired
+  };
+
+  render () {
+    const { media } = this.props;
+    const status = media.get('status');
+
+    let content, style;
+
+    if (media.get('type') === 'gifv') {
+      content = <span className='media-gallery__gifv__label'>GIF</span>;
+    }
+
+    if (!status.get('sensitive')) {
+      style = { backgroundImage: `url(${media.get('preview_url')})` };
+    }
+
+    return (
+      <div className='account-gallery__item'>
+        <Permalink
+          to={`/statuses/${status.get('id')}`}
+          href={status.get('url')}
+          style={style}>
+          {content}
+        </Permalink>
+      </div>
+    );
+  }
+}
+
+export default MediaItem;