Make app list recommendations into their own DisplayType.

ui/app_list/search_result.h

Index: ui/app_list/search_result.h
diff --git a/ui/app_list/search_result.h b/ui/app_list/search_result.h
index f2894bb3339d93992721f315c069eb51d826cc95..95bc5e55ee2b94ba5d0bc7bf032e91611b2327a1 100644
--- a/ui/app_list/search_result.h
+++ b/ui/app_list/search_result.h
@@ -32,6 +32,7 @@ class APP_LIST_EXPORT SearchResult {
   enum DisplayType {
     DISPLAY_LIST,
     DISPLAY_TILE,
+    DISPLAY_RECOMMENDATION,

[Matt Giuca, 2014/12/11 08:00:57]

// RECOMMENDATION is essentially the same as TILE, but has a separate type, to
avoid recommendations flashing up on search results, and vice versa.

[calamity, 2014/12/12 05:00:24]

Is this necessary? I don't have a comment there saying that TILE is essentially
the same as LIST except it has a different size and prevents TILE results from
showing in the LIST results and vice versa.

[Matt Giuca, 2014/12/12 05:13:58]

OK fair enough.

     DISPLAY_NONE,
   };