Add an about:flag to enable client-side LoFi

tools/metrics/histograms/enums.xml

Index: tools/metrics/histograms/enums.xml
diff --git a/tools/metrics/histograms/enums.xml b/tools/metrics/histograms/enums.xml
index 4de19ab54f36ee148e61ac6942e171e45d2bc1d5..cbcc44449cedeeaad4ae64bffd34a71cd1591c37 100644
--- a/tools/metrics/histograms/enums.xml
+++ b/tools/metrics/histograms/enums.xml
@@ -21317,6 +21317,7 @@ from previous Chrome versions.
   <int value="-1176748003"
       label="FramebustingNeedsSameOriginOrUserGesture:disabled"/>
   <int value="-1176493523" label="enable-md-extensions"/>
+  <int value="-1174267639" label="ClientLoFi:disabled"/>
   <int value="-1172572865" label="NTPShowGoogleGInOmnibox:enabled"/>
   <int value="-1172204005" label="enable-offline-auto-reload-visible-only"/>
   <int value="-1162944097" label="enable-color-correct-rendering"/>
@@ -21435,6 +21436,7 @@ from previous Chrome versions.
   <int value="-770319039" label="enable-touch-editing"/>
   <int value="-763759697" label="enable-audio-support-for-desktop-share"/>
   <int value="-759830869" label="enable-tab-discarding"/>
+  <int value="-750175757" label="ClientLoFi:enabled"/>
   <int value="-749048160" label="enable-panels"/>
   <int value="-747463111" label="ContentSuggestionsNotifications:disabled"/>
   <int value="-746328467" label="ExpensiveBackgroundTimerThrottling:disabled"/>