Adds ash::MaterialDesignController

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 34e02a3ff0a02d44f7eb9fdce70700eb3fbfc5fb..975491e58f542a8eeb0e105e98b95b4bb1b55877 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -76018,6 +76018,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="752939691" label="disable-tab-for-desktop-share"/>
   <int value="773919225" label="disable-office-editing-component-extension"/>
   <int value="779086132" label="enable-data-reduction-proxy-alt"/>
+  <int value="781156558" label="ash-disable-md"/>
   <int value="782167080" label="enable-new-qp-input-view"/>
   <int value="807734471" label="tab-management-experiment-type-disabled"/>
   <int value="811374216" label="disable-new-bookmark-apps"/>
@@ -76043,6 +76044,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="903267263" label="disable-offline-pages"/>
   <int value="909439558" label="disable-device-discovery"/>
   <int value="916316159" label="disable-new-app-list-mixer"/>
+  <int value="924667578" label="ash-enable-md"/>
   <int value="929462705" label="disable-link-disambiguation-popup"/>
   <int value="936919953" label="bypass-app-banner-engagement-checks"/>
   <int value="939554480" label="enable-credit-card-scan"/>