Make app list recommendations into their own DisplayType.

ui/app_list/search_result.h

 // Copyright (c) 2012 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 UI_APP_LIST_SEARCH_RESULT_H_
 #define UI_APP_LIST_SEARCH_RESULT_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 14 matching lines @@
 
 // SearchResult consists of an icon, title text and details text. Title and
 // details text can have tagged ranges that are displayed differently from
 // default style.
 class APP_LIST_EXPORT SearchResult {
  public:
   // How the result should be displayed.
   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,
   };
 
   // A tagged range in search result text.
   struct APP_LIST_EXPORT Tag {
     // Similar to ACMatchClassification::Style, the style values are not
     // mutually exclusive.
     enum Style {
       NONE  = 0,
       URL   = 1 << 0,
@@ skipping 115 matching lines @@
   int percent_downloaded_;
 
   ObserverList<SearchResultObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchResult);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_SEARCH_RESULT_H_