Allow AppSearchProvider to provide recommendations.

ui/app_list/search_provider.h

Index: ui/app_list/search_provider.h
diff --git a/ui/app_list/search_provider.h b/ui/app_list/search_provider.h
index f8ebfd0133d2ef685ddd8bf507213b396475c8c6..472e82fe3948f7ab95f854e9f4e55c13b0422292 100644
--- a/ui/app_list/search_provider.h
+++ b/ui/app_list/search_provider.h
@@ -24,7 +24,10 @@ class APP_LIST_EXPORT SearchProvider {
   SearchProvider();
   virtual ~SearchProvider();
 
-  // Invoked to start a query.
+  // Invoked to start a query for recommendations.
+  virtual void FetchRecommendations();

[Matt Giuca, 2014/07/22 04:31:08]

I'm wondering if it's simpler to just make Start("") fetch recommendations. It
would eliminate a lot of methods and a little bit of code. It looks like the two
operations are more similar than different, but maybe you object.

[calamity, 2014/07/22 07:24:04]

I agree. I walked in thinking this would be cleaner but looking now, it seems
unnecessary.

+
+  // Invoked to start a query for a search term.
   virtual void Start(const base::string16& query) = 0;
 
   // Invoked to stop the current query and no more results changes.