Add tby@ as histograms OWNER for ML team metrics

We've previously had approvals so that I could LGTM metrics for the
chrome knowledge team. We'd like to continue that system under the
new split of histograms files if possible, so this CL adds me as
owner to the directories we have metrics in. Specifically, those are:

 - apps/ and ash/ for launcher ml
 - auto/ for auto screen brightness
 - local/ for local search service
 - others/ for the ml service
 - power/ for power ml

Change-Id: I5a7232c363374fb225e0aabd41a9891fe07e44c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2466017
Commit-Queue: Tony Yeoman <tby@chromium.org>
Reviewed-by: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817252}

tools/metrics/histograms/histograms_xml/apps/OWNERS

+# Prefer chromium-metrics-reviews@google.com instead.
+# Use the following owners only if:
+#  - The reviewer is available for review.
+#  - You work in the same area as them.
+#  - They are already a good reviewer for the non-metrics part of the CL.
+# See tools/metrics/histograms/histograms_xml/OWNERS for details.
+tby@chromium.org

tools/metrics/histograms/histograms_xml/ash/OWNERS

+# Prefer chromium-metrics-reviews@google.com instead.
+# Use the following owners only if:
+#  - The reviewer is available for review.
+#  - You work in the same area as them.
+#  - They are already a good reviewer for the non-metrics part of the CL.
+# See tools/metrics/histograms/histograms_xml/OWNERS for details.
+tby@chromium.org

tools/metrics/histograms/histograms_xml/auto/OWNERS

+# Prefer chromium-metrics-reviews@google.com instead.
+# Use the following owners only if:
+#  - The reviewer is available for review.
+#  - You work in the same area as them.
+#  - They are already a good reviewer for the non-metrics part of the CL.
+# See tools/metrics/histograms/histograms_xml/OWNERS for details.
+tby@chromium.org

tools/metrics/histograms/histograms_xml/local/OWNERS

+# Prefer chromium-metrics-reviews@google.com instead.
+# Use the following owners only if:
+#  - The reviewer is available for review.
+#  - You work in the same area as them.
+#  - They are already a good reviewer for the non-metrics part of the CL.
+# See tools/metrics/histograms/histograms_xml/OWNERS for details.
+tby@chromium.org

tools/metrics/histograms/histograms_xml/others/OWNERS

@@ -3,5 +3,6 @@
 #  - The reviewer is available for review.
 #  - You work in the same area as them.
 #  - They are already a good reviewer for the non-metrics part of the CL.
-# See tools/metrics/histograms/OWNERS for details.
+# See tools/metrics/histograms/histograms_xml/OWNERS for details.
 tbansal@chromium.org
+tby@chromium.org

tools/metrics/histograms/histograms_xml/power/OWNERS

+# Prefer chromium-metrics-reviews@google.com instead.
+# Use the following owners only if:
+#  - The reviewer is available for review.
+#  - You work in the same area as them.
+#  - They are already a good reviewer for the non-metrics part of the CL.
+# See tools/metrics/histograms/histograms_xml/OWNERS for details.
+tby@chromium.org