digitalgoods:Enable digital goods origin trial on Chrome OS

Bug: 1145757

Change-Id: Ib2b59562da450c5608fb727bef99a8d41db1e971
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2566535
Auto-Submit: Glen Robertson <glenrob@chromium.org>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832403}

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -712,7 +712,7 @@
     {
       name: "DigitalGoods",
       origin_trial_feature_name: "DigitalGoods",
-      origin_trial_os: ["android"],
+      origin_trial_os: ["android", "chromeos"],
       status: {
         "Android": "experimental",
         "ChromeOS": "experimental",