Add chrome slices track

Change-Id: I86063a79b0ace8ba2b5538ccacff14cd1b2c0830
diff --git a/ui/src/frontend/track_panel.ts b/ui/src/frontend/track_panel.ts
index 6339cd8..2f8cf24 100644
--- a/ui/src/frontend/track_panel.ts
+++ b/ui/src/frontend/track_panel.ts
@@ -24,7 +24,7 @@
 import {Track} from './track';
 import {trackRegistry} from './track_registry';
 
-export const TRACK_SHELL_WIDTH = 200;
+export const TRACK_SHELL_WIDTH = 300;
 
 const TrackShell = {
   view({attrs}) {