[Remote suggestions] Add a remote suggestions flag to choose the source

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 eccabfb3262ad0516e704d1e72a69ba1b16ddc07..9817f302364febaf0aaf7a59d6b6b8a1999aa8c8 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -97983,6 +97983,7 @@ value.
   <int value="-1888273969" label="tab-capture-upscale-quality"/>
   <int value="-1887053262"
       label="enable-zero-suggest-most-visited-without-serp"/>
+  <int value="-1882330924" label="NTPArticleSuggestions:enabled"/>
   <int value="-1880355454" label="disable-topchrome-md"/>
   <int value="-1876881908"
       label="disable-infobar-for-protected-media-identifier"/>
@@ -98636,6 +98637,7 @@ value.
   <int value="952558794" label="enable-remote-assistance"/>
   <int value="980396200" label="enable-new-korean-ime"/>
   <int value="982032277" label="NTPOfflineBadge:disabled"/>
+  <int value="982511393" label="NTPArticleSuggestions:disabled"/>
   <int value="983311394" label="tab-management-experiment-type"/>
   <int value="1000706989" label="AutomaticTabDiscarding:disabled"/>
   <int value="1002585107" label="emphasize-titles-in-omnibox-dropdown"/>