Added flag simplified-fullscreen-ui.

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 f866bfbe3f88ba4da8303ea4274ed17bf365ff5e..8c70f9daf168380188dd739a61552f91ab244954 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -61123,6 +61123,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="-1392562498" label="disable-origin-chip"/>
   <int value="-1386966873" label="disable-mac-views-native-app-windows"/>
   <int value="-1375111024" label="enable-fixed-position-compositing"/>
+  <int value="-1365503870" label="enable-simplified-fullscreen-ui"/>
   <int value="-1358669137" label="enable-supervised-user-blacklist"/>
   <int value="-1357655121" label="enable-iframe-based-signin"/>
   <int value="-1349872906"
@@ -61170,6 +61171,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="-996673716" label="enable-web-app-frame"/>
   <int value="-979057409" label="enable-seccomp-filter-sandbox"/>
   <int value="-979034258" label="disable-ntp-other-sessions-menu"/>
+  <int value="-978700508" label="disable-simplified-fullscreen-ui"/>
   <int value="-972425050" label="gesture-editing"/>
   <int value="-964676765" label="enable-accelerated-mjpeg-decode"/>
   <int value="-951394314" label="top-chrome-md"/>