perfetto-ui: Re-enable summary tracks

Trace processor has got a lot faster - we should try turning summary
tracks back on.

Change-Id: I9cd990298252e5659f0bb11167d172671f5ef820
diff --git a/ui/src/frontend/track_group_panel.ts b/ui/src/frontend/track_group_panel.ts
index af83b98..05f0357 100644
--- a/ui/src/frontend/track_group_panel.ts
+++ b/ui/src/frontend/track_group_panel.ts
@@ -97,13 +97,7 @@
         size.height);
 
     ctx.translate(this.shellWidth, 0);
-
-    // Do not show summary view if there are more than 10 track groups.
-    // Too slow now.
-    // TODO(dproy): Fix this.
-    if (Object.keys(globals.state.trackGroups).length < 10) {
-      this.summaryTrack.renderCanvas(ctx);
-    }
+    this.summaryTrack.renderCanvas(ctx);
     ctx.restore();
   }
 }