[AppList] Add a Suggestions Provider to applist.

chrome/browser/ui/app_list/search/search_controller_factory.cc

Index: chrome/browser/ui/app_list/search/search_controller_factory.cc
diff --git a/chrome/browser/ui/app_list/search/search_controller_factory.cc b/chrome/browser/ui/app_list/search/search_controller_factory.cc
index c9fa326c42f51d6308719b52ccc5f583eeb0c574..98a8cc2b90a6de5a02480e069006ed1d9984b1d2 100644
--- a/chrome/browser/ui/app_list/search/search_controller_factory.cc
+++ b/chrome/browser/ui/app_list/search/search_controller_factory.cc
@@ -5,11 +5,14 @@
 #include "chrome/browser/ui/app_list/search/search_controller_factory.h"
 
 #include "base/command_line.h"
+#include "base/metrics/field_trial.h"
+#include "base/strings/string_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/app_list/search/app_search_provider.h"
 #include "chrome/browser/ui/app_list/search/history_factory.h"
 #include "chrome/browser/ui/app_list/search/omnibox_provider.h"
 #include "chrome/browser/ui/app_list/search/people/people_provider.h"
+#include "chrome/browser/ui/app_list/search/suggestions/suggestions_search_provider.h"
 #include "chrome/browser/ui/app_list/search/webstore/webstore_provider.h"
 #include "chrome/common/chrome_switches.h"
 #include "ui/app_list/search/mixer.h"
@@ -17,6 +20,22 @@
 
 namespace app_list {
 
+namespace {
+
+// Constants related to the SuggestionsService in AppList field trial.
+const char kSuggestionsProviderFieldTrialName[] = "SuggestionsAppListProvider";
+const char kSuggestionsProviderFieldTrialEnabledPrefix[] = "Enabled";
+
+// Returns whether the user is part of a group where the Suggestions provider is
+// enabled.
+bool IsSuggestionsSearchProviderEnabled() {
+  return StartsWithASCII(
+      base::FieldTrialList::FindFullName(kSuggestionsProviderFieldTrialName),
+      kSuggestionsProviderFieldTrialEnabledPrefix, true);
+}
+
+}  // namespace
+
 scoped_ptr<SearchController> CreateSearchController(
     Profile* profile,
     SearchBoxModel* search_box,
@@ -40,6 +59,12 @@ scoped_ptr<SearchController> CreateSearchController(
                             scoped_ptr<SearchProvider>(
                                 new PeopleProvider(profile, list_controller)));
   }
+  if (IsSuggestionsSearchProviderEnabled()) {
+    controller->AddProvider(
+        Mixer::SUGGESTIONS_GROUP,
+        scoped_ptr<SearchProvider>(
+            new SuggestionsSearchProvider(profile, list_controller)));
+  }
 
   return controller.Pass();
 }