Add UMA for the content suggestions settings

components/ntp_snippets/content_suggestions_service.cc

Index: components/ntp_snippets/content_suggestions_service.cc
diff --git a/components/ntp_snippets/content_suggestions_service.cc b/components/ntp_snippets/content_suggestions_service.cc
index f808d74e35c9d830ea6193e2b90aa6d89428402a..8cc0a1b3c2481949f637976e1274e4ed6da7353c 100644
--- a/components/ntp_snippets/content_suggestions_service.cc
+++ b/components/ntp_snippets/content_suggestions_service.cc
@@ -12,6 +12,7 @@
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/default_clock.h"
@@ -49,6 +50,10 @@ ContentSuggestionsService::ContentSuggestionsService(
   }
 
   RestoreDismissedCategoriesFromPrefs();
+
+  UMA_HISTOGRAM_BOOLEAN(
+      "NewTabPage.ContentSuggestions.Preferences.RemoteSuggestions",
+      IsRemoteSuggestionsServiceEnabled());

[Marc Treib, 2017/04/06 15:39:30]

So far, all the metrics recording code lives in the separate metrics.h/cc files.
Can we stay with that?

[dgn, 2017/04/06 17:28:12]

Done.

 }
 
 ContentSuggestionsService::~ContentSuggestionsService() = default;