[AppList] Add a Suggestions Provider to applist.

ui/app_list/search/mixer.cc

Index: ui/app_list/search/mixer.cc
diff --git a/ui/app_list/search/mixer.cc b/ui/app_list/search/mixer.cc
index e9b0f1b747302172b524a8a09ecaf1d465512b9b..24f13f93b64cddb7f360d44ff503a206ee3d0ab5 100644
--- a/ui/app_list/search/mixer.cc
+++ b/ui/app_list/search/mixer.cc
@@ -22,6 +22,7 @@ const size_t kMaxResults = 6;
 const size_t kMaxMainGroupResults = 4;
 const size_t kMaxWebstoreResults = 2;
 const size_t kMaxPeopleResults = 2;
+const size_t kMaxSuggestionsResults = 4;

[Mathieu, 2014/12/03 21:01:31]

App launcher folks: I'm not sure any of this is necessary since we're only doing
null-query. Thoughts?

 
 // A value to indicate no max number of results limit.
 const size_t kNoMaxResultsLimit = 0;
@@ -127,6 +128,7 @@ void Mixer::Init() {
   groups_[OMNIBOX_GROUP].reset(new Group(kNoMaxResultsLimit, 2.0));
   groups_[WEBSTORE_GROUP].reset(new Group(kMaxWebstoreResults, 1.0));
   groups_[PEOPLE_GROUP].reset(new Group(kMaxPeopleResults, 0.0));
+  groups_[SUGGESTIONS_GROUP].reset(new Group(kMaxSuggestionsResults, 2.0));
 }
 
 void Mixer::AddProviderToGroup(GroupId group, SearchProvider* provider) {
@@ -143,6 +145,7 @@ void Mixer::MixAndPublish(const KnownResults& known_results) {
   const Group& omnibox_group = *groups_[OMNIBOX_GROUP];
   const Group& webstore_group = *groups_[WEBSTORE_GROUP];
   const Group& people_group = *groups_[PEOPLE_GROUP];
+  const Group& suggestions_group = *groups_[SUGGESTIONS_GROUP];
 
   // Adds main group and web store results first.
   results.insert(results.end(), main_group.results().begin(),
@@ -151,6 +154,8 @@ void Mixer::MixAndPublish(const KnownResults& known_results) {
                  webstore_group.results().end());
   results.insert(results.end(), people_group.results().begin(),
                  people_group.results().end());
+  results.insert(results.end(), suggestions_group.results().begin(),
+                 suggestions_group.results().end());
 
   // Collapse duplicate apps from local and web store.
   RemoveDuplicates(&results);