[Suggested files] Gate file chips behind suggested content toggle

Bug: 1034842
Change-Id: I00eb83f557262e97d990cd4544b55a68f8c31aa4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617403Reviewed-by: Rachel Wong <wrong@chromium.org>
Commit-Queue: Tony Yeoman <tby@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842833}

chrome/browser/ui/app_list/search/files/drive_zero_state_provider.cc

@@ -72,7 +72,9 @@ DriveZeroStateProvider::DriveZeroStateProvider(
       drive_service_(
           drive::DriveIntegrationServiceFactory::GetForProfile(profile)),
       item_suggest_cache_(profile, std::move(url_loader_factory)),
-      suggested_files_enabled_(app_list_features::IsSuggestedFilesEnabled()) {
+      suggested_files_enabled_(app_list_features::IsSuggestedFilesEnabled() &&
+                               profile->GetPrefs()->GetBoolean(
+                                   chromeos::prefs::kSuggestedContentEnabled)) {
   DCHECK(profile_);
   DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   task_runner_ = base::ThreadPool::CreateSequencedTaskRunner(

chrome/browser/ui/app_list/search/files/drive_zero_state_provider.h

@@ -68,7 +68,8 @@ class DriveZeroStateProvider : public SearchProvider,
 
   base::TimeTicks query_start_time_;
 
-  // Whether the suggested files experiment is enabled.
+  // Whether suggested files feature is enabled. True if both the experiment is
+  // enabled, and the suggested content toggle is enabled.
   const bool suggested_files_enabled_;
 
   // The normalizer normalizes the relevance scores of Results