[Chrome OS] Change layout of the launcher.

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 39 matching lines @@
   dispatching_query_ = true;
   for (Providers::iterator it = providers_.begin();
        it != providers_.end();
        ++it) {
     (*it)->Start(is_voice_query, query);
   }
   dispatching_query_ = false;
 
   is_voice_query_ = is_voice_query;
 
-  OnResultsChanged();
+  OnResultsChanged(query.empty());

[xiyuan, 2016/08/09 17:49:09]

We should remember empty query in a member var instead of passing it to
OnResultsChanged. Also prefer to call it query_for_recommendation_ instead of
is_empty_query_ and do it after line 58 and before this line.

[xdai1, 2016/08/09 20:14:17]

Done.

 
   stop_timer_.Start(FROM_HERE,
                     base::TimeDelta::FromMilliseconds(kStopTimeMS),
                     base::Bind(&SearchController::Stop,
                                base::Unretained(this)));
 }
 
 void SearchController::Stop() {
   stop_timer_.Stop();
 
@@ skipping 41 matching lines @@
   result->InvokeAction(action_index, event_flags);
 }
 
 size_t SearchController::AddGroup(size_t max_results, double multiplier) {
   return mixer_->AddGroup(max_results, multiplier);
 }
 
 void SearchController::AddProvider(size_t group_id,
                                    std::unique_ptr<SearchProvider> provider) {
   provider->set_result_changed_callback(base::Bind(
-      &SearchController::OnResultsChanged,
-      base::Unretained(this)));
+      &SearchController::OnResultsChanged, base::Unretained(this), true));

[xiyuan, 2016/08/09 17:49:09]

As aforementioned, let's remember the query_for_recommendation_ and use that in
OnResultsChanged instead of binding true here.

[xdai1, 2016/08/09 20:14:17]

Done.

   mixer_->AddProviderToGroup(group_id, provider.get());
   providers_.push_back(std::move(provider));
 }
 
-void SearchController::OnResultsChanged() {
+void SearchController::OnResultsChanged(bool is_empty_query) {
   if (dispatching_query_)
     return;
 
   KnownResults known_results;
   if (history_ && history_->IsReady()) {
     history_->GetKnownResults(base::UTF16ToUTF8(search_box_->text()))
         ->swap(known_results);
   }
 
-  mixer_->MixAndPublish(is_voice_query_, known_results);
+  mixer_->MixAndPublish(is_empty_query, is_voice_query_, known_results);
 }
 
 }  // namespace app_list