SuperSize: Cache Caspian WebAssembly assets in ServiceWorker

Since caspian_web.wasm has grown to about 8MB, it's probably a good idea
to cache it via the ServiceWorker.

Change-Id: I60f115d8fe2f557d83b7824090330eec1b07c395
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1949068Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Jasper Chapman-Black <jaspercb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721124}

tools/binary_size/libsupersize/templates/sw.js

@@ -7,6 +7,9 @@
 
 const cacheName = '{{cache_hash}}';
 const filesToCache = [
+  'caspian_web.wasm.map',
+  'caspian_web.js',
+  'caspian_web.wasm',
   'favicon.ico',
   'viewer.html',
   'infocard-ui.js',
@@ -19,6 +22,7 @@ const filesToCache = [
   'state.js',
   'tree-ui.js',
   'tree-worker.js',
+  'tree-worker-wasm.js',
 ];
 
 // On install, cache the items in the `filesToCache` list