[NTP Snippets] Limit the number of snippets to 10

components/ntp_snippets/ntp_snippets_service.h

Index: components/ntp_snippets/ntp_snippets_service.h
diff --git a/components/ntp_snippets/ntp_snippets_service.h b/components/ntp_snippets/ntp_snippets_service.h
index e6dac62e61826dc9de340ba5c210ec2cd1d83343..7bf54f094e1534b63e4d7204cd1c203baf81feab 100644
--- a/components/ntp_snippets/ntp_snippets_service.h
+++ b/components/ntp_snippets/ntp_snippets_service.h
@@ -124,6 +124,9 @@ class NTPSnippetsService : public KeyedService {
   const_iterator begin() const { return const_iterator(snippets_.begin()); }
   const_iterator end() const { return const_iterator(snippets_.end()); }
 
+  // Returns the maximum number of snippets that will be shown at once.
+  static int GetMaxSnippetCountForTesting();
+
  private:
   friend class NTPSnippetsServiceTest;