Add UMA for the content suggestions settings

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 93d11fe595e55d2da3c2b24cadc283f6313be500..5e2ff6da053f998cf9ea1c3175fc475b64d281fa 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -41251,6 +41251,17 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="NewTabPage.ContentSuggestions.Preferences.RemoteSuggestions"
+    enum="BooleanEnabled">
+  <owner>dgn@chromium.org</owner>
+  <owner>finkm@chromium.org</owner>
+  <summary>
+    Whether content suggestions from the remote service are enabled. It is
+    checked at startup. Note: This histogram is not specific to the New Tab
+    Page.
+  </summary>
+</histogram>
+
 <histogram name="NewTabPage.ContentSuggestions.Shown" units="index">
   <owner>treib@chromium.org</owner>
   <summary>
@@ -86385,6 +86396,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="4" label="Hidden (Chrome became frontmost)"/>
   <int value="5" label="Hidden (Category disabled)"/>
   <int value="6" label="Hidden (Content Suggestion Service shut down)"/>
+  <int value="7" label="Settings"/>
 </enum>
 
 <enum name="ContentSuggestionsNotificationsImpression" type="int">