Optimization: not sending answer server requests for voice queries.

ui/app_list/search_controller.cc

 // 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.
 
 #include "ui/app_list/search_controller.h"
 
 #include <algorithm>
 #include <memory>
 #include <utility>
 #include <vector>
@@ skipping 18 matching lines @@
 namespace app_list {
 
 SearchController::SearchController(SearchBoxModel* search_box,
                                    AppListModel::SearchResults* results,
                                    History* history)
     : search_box_(search_box), mixer_(new Mixer(results)), history_(history) {}
 
 SearchController::~SearchController() {
 }
 
-void SearchController::Start(bool is_voice_query) {
+void SearchController::Start() {
   Stop();
 
   base::string16 query;
   base::TrimWhitespace(search_box_->text(), base::TRIM_ALL, &query);
 
+  is_voice_query_ = search_box_->is_voice_query();
+
   dispatching_query_ = true;
   for (const auto& provider : providers_)
-    provider->Start(is_voice_query, query);
+    provider->Start(is_voice_query_, query);
 
   dispatching_query_ = false;
   query_for_recommendation_ = query.empty() ? true : false;
 
-  is_voice_query_ = is_voice_query;
-
   OnResultsChanged();
 
   stop_timer_.Start(FROM_HERE,
                     base::TimeDelta::FromMilliseconds(kStopTimeMS),
                     base::Bind(&SearchController::Stop,
                                base::Unretained(this)));
 }
 
 void SearchController::Stop() {
   stop_timer_.Stop();
@@ skipping 60 matching lines @@
     history_->GetKnownResults(base::UTF16ToUTF8(search_box_->text()))
         ->swap(known_results);
   }
 
   size_t num_max_results =
       query_for_recommendation_ ? kNumStartPageTiles : kMaxSearchResults;
   mixer_->MixAndPublish(is_voice_query_, known_results, num_max_results);
 }
 
 }  // namespace app_list