[AppList] Add a Suggestions Provider to applist.

ui/app_list/search/mixer.h

 // Copyright 2013 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_MIXER_H_
 #define UI_APP_LIST_SEARCH_MIXER_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 19 matching lines @@
 // main group takes no more than 4 slots. The web store takes no more than 2
 // slots. The omnibox group takes all the remaining slots.
 class APP_LIST_EXPORT Mixer {
  public:
   // The enum represents mixer groups. Each must have a Group added in Init().
   enum GroupId {
     MAIN_GROUP = 0,
     OMNIBOX_GROUP = 1,
     WEBSTORE_GROUP = 2,
     PEOPLE_GROUP = 3,
+    SUGGESTIONS_GROUP = 4,
   };
 
   explicit Mixer(AppListModel::SearchResults* ui_results);
   ~Mixer();
 
   // Creates mixer groups.
   void Init();
 
   // Associates a provider with a mixer group.
   void AddProviderToGroup(GroupId group, SearchProvider* provider);
@@ skipping 32 matching lines @@
 
   AppListModel::SearchResults* ui_results_;  // Not owned.
   Groups groups_;
 
   DISALLOW_COPY_AND_ASSIGN(Mixer);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_SEARCH_MIXER_H_