[tricium] Add a tricium project config to chromium/src

At first, we can enable Tricium with reporting disabled,
just to see its affect on load/error rate and number of
comments produced.

Change-Id: Ie3ea0b0c0ac5844d893d965d84fbfb342681552f
Reviewed-on: https://chromium-review.googlesource.com/1161006Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Reviewed-by: Erik Staab <estaab@chromium.org>
Commit-Queue: Quinten Yearsley <qyearsley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580354}

infra/config/global/tricium-prod.cfg

+# Schema for this config file: ProjectConfig in
+# luci-config.appspot.com/schemas/projects:tricium-prod.cfg
+
+acls {
+  role: REQUESTER
+  group: "tricium-chromium-requesters"
+}
+
+selections {
+  function: "GitFileIsolator"
+  platform: UBUNTU
+}
+
+selections {
+  function: "SpellChecker"
+  platform: UBUNTU
+}
+
+repos {
+  gerrit_project {
+    host: "chromium-review.googlesource.com"
+    project: "chromium/src"
+    git_url: "https://chromium.googlesource.com/chromium/src"
+  }
+  disable_reporting: true
+}
+
+service_account: "tricium-prod@appspot.gserviceaccount.com"
+swarming_service_account: "swarming@tricium-prod.iam.gserviceaccount.com"