Enable "chromium.resultdb.result_sink" experiment on chromium try builders at 80%

Bug: 1108016
Change-Id: Ie47d14bf422d2b230c2d119dd395e6bf1a923ae3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545070
Commit-Queue: Chan Li <chanli@chromium.org>
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828902}

infra/config/lib/try.star

@@ -163,9 +163,9 @@ def try_builder(
     if not branches.matches(branch_selector):
         return
 
-    # Enable "chromium.resultdb.result_sink" on try builders at 50%.
+    # Enable "chromium.resultdb.result_sink" on try builders at 80%.
     experiments = experiments or {}
-    experiments.setdefault("chromium.resultdb.result_sink", 50)
+    experiments.setdefault("chromium.resultdb.result_sink", 80)
 
     merged_resultdb_bigquery_exports = [
         resultdb.export_test_results(