Introduce a Doodle Fetcher for NTP

chrome/browser/search/instant_service.h

Index: chrome/browser/search/instant_service.h
diff --git a/chrome/browser/search/instant_service.h b/chrome/browser/search/instant_service.h
index 064ca1db30aa7e21846c3eff2825d659fe0d0794..9b99fa178e23ffd8c8325ba1f8e2d1156c1c62dd 100644
--- a/chrome/browser/search/instant_service.h
+++ b/chrome/browser/search/instant_service.h
@@ -34,6 +34,10 @@ struct TemplateURLData;
 class TemplateURLService;
 struct ThemeBackgroundInfo;
 
+namespace doodle {
+class DoodleFetcher;
+}
+
 namespace content {
 class RenderProcessHost;
 }
@@ -186,6 +190,7 @@ class InstantService : public KeyedService,
   // be non-null.
   std::unique_ptr<ntp_tiles::MostVisitedSites> most_visited_sites_;
   scoped_refptr<history::TopSites> top_sites_;
+  std::unique_ptr<doodle::DoodleFetcher> doodle_fetcher_;
 
   // Used for Top Sites async retrieval.
   base::WeakPtrFactory<InstantService> weak_ptr_factory_;