[NTP::SectionOrder] Add a flag to choose category ranker.

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 06a962e5f5d7ccf149c6cb7d33398df4a5972375..954f2da526acf3b24a320c48ef6f27b80c8237de 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -93578,6 +93578,7 @@ value.
   <int value="-1832575380" label="show-saved-copy"/>
   <int value="-1832221649" label="disable-out-of-process-pac"/>
   <int value="-1821058653" label="enable-delay-agnostic-aec"/>
+  <int value="-1812579951" label="ContentSuggestionsCategoryRanker:enabled"/>
   <int value="-1811394154" label="disable-webrtc-hw-vp8-encoding"/>
   <int value="-1804485171" label="disable-fullscreen-tab-detaching"/>
   <int value="-1802502753" label="enable-manual-password-generation:enabled"/>
@@ -94084,6 +94085,7 @@ value.
   <int value="550387510" label="NTPAssetDownloadSuggestions:disabled"/>
   <int value="567368307" label="enable-experimental-canvas-features"/>
   <int value="581118445" label="enable-eol-notification"/>
+  <int value="581355159" label="ContentSuggestionsCategoryRanker:disabled"/>
   <int value="584541349" label="ContextualSearchSingleActions:disabled"/>
   <int value="592050831" label="disable-slimming-paint"/>
   <int value="593707592" label="disable-network-portal-notification"/>