tools cts/roll: Generate cache file list

Will be used by GN to know the outputs of the generate cache step.

Change-Id: Iae09477fb355eac41ff9b2204605f46ed78e08ec
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/110620
Reviewed-by: Austin Eng <enga@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
diff --git a/tools/src/cmd/cts/roll/roll_test.go b/tools/src/cmd/cts/roll/roll_test.go
index 08fc082..a776afc3 100644
--- a/tools/src/cmd/cts/roll/roll_test.go
+++ b/tools/src/cmd/cts/roll/roll_test.go
@@ -58,9 +58,11 @@
 	)
 	expect := `Roll third_party/webgpu-cts/ d5e605a55..29275672e (2 commits)
 
-Update:
+Regenerated:
  - expectations.txt
  - ts_sources.txt
+ - test_list.txt
+ - cache_list.txt
  - resource_files.txt
  - webtest .html files