Implement people search.

chrome/browser/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 CHROME_BROWSER_UI_APP_LIST_SEARCH_MIXER_H_
 #define CHROME_BROWSER_UI_APP_LIST_SEARCH_MIXER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_vector.h"
 #include "chrome/browser/ui/app_list/search/history_types.h"
@@ skipping 10 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 Mixer {
  public:
   // The enum represents mixer groups. Note this must matches the order
   // of group creation in Init().
   enum GroupId {
     MAIN_GROUP = 0,
     OMNIBOX_GROUP = 1,
     WEBSTORE_GROUP = 2,
+    PEOPLE_GROUP = 3,
   };
 
   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);
 
   // Collects the results, sorts and publishes them.
   void MixAndPublish(const KnownResults& known_results);
 
  private:
   class Group;
   typedef ScopedVector<Group> Groups;
 
   void FetchResults(const KnownResults& known_results);
 
   AppListModel::SearchResults* ui_results_;  // Not owned.
   Groups groups_;
 
   DISALLOW_COPY_AND_ASSIGN(Mixer);
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_SEARCH_MIXER_H_