Initial CL for Data Saver (Flywheel) prompt when cellular network detected

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index bd419fd674f4a9a1442618fbeaa1c12f88959c5a..9e6330baebe292109f783c50701199d06dc8b10f 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -54060,12 +54060,14 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="-1341092934" label="enable-accelerated-overflow-scroll"/>
   <int value="-1340055960" label="enable-streamlined-hosted-apps"/>
   <int value="-1334327410" label="ash-enable-touch-view-testing"/>
+  <int value="-1322882747" label="disable-datasaver-prompt"/>
   <int value="-1319688939" label="ignore-gpu-blacklist"/>
   <int value="-1285021473" label="save-page-as-mhtml"/>
   <int value="-1268836676" label="disable-out-of-process-pdf"/>
   <int value="-1267958145" label="disable-pdf-material-ui"/>
   <int value="-1251411236" label="disable-new-md-input-view"/>
   <int value="-1241747717" label="enable-android-password-link"/>
+  <int value="-1235586511" label="enable-datasaver-prompt"/>
   <int value="-1218608640" label="disable-offline-load-stale-cache"/>
   <int value="-1216837777" label="clear-data-reduction-proxy-data-savings"/>
   <int value="-1212273428" label="enable-experimental-app-list"/>