[NTP Snippets] Limit the number of snippets to 10

components/ntp_snippets/ntp_snippets_service.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_NTP_SNIPPETS_NTP_SNIPPETS_SERVICE_H_
 #define COMPONENTS_NTP_SNIPPETS_NTP_SNIPPETS_SERVICE_H_
 
 #include <stddef.h>
 
 #include <set>
@@ skipping 106 matching lines @@
   // The snippets can be iterated upon only via a const_iterator. Recommended
   // way to iterate is as follows:
   //
   // NTPSnippetsService* service; // Assume is set.
   //  for (auto& snippet : *service) {
   //    // |snippet| here is a const object.
   //  }
   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;
 
   void OnSuggestionsChanged(const suggestions::SuggestionsProfile& suggestions);
   void OnSnippetsDownloaded(const std::string& snippets_json,
                             const std::string& status);
 
   void OnJsonParsed(const std::string& snippets_json,
                     scoped_ptr<base::Value> parsed);
   void OnJsonError(const std::string& snippets_json, const std::string& error);
@@ skipping 77 matching lines @@
   // Sent when the service is shutting down.
   virtual void NTPSnippetsServiceShutdown() = 0;
 
  protected:
   virtual ~NTPSnippetsServiceObserver() {}
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_NTP_SNIPPETS_SERVICE_H_