Updates the mic icon status based on the device's audio state.

ui/app_list/views/search_box_view.cc

 // Copyright (c) 2012 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/views/search_box_view.h"
 
 #include <algorithm>
 
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/app_list_model.h"
@@ skipping 248 matching lines @@
           views::Button::STATE_NORMAL, &speech_button_prop->off_icon);
       speech_button_->SetTooltipText(speech_button_prop->off_tooltip);
     }
   } else {
     if (speech_button_) {
       // Deleting a view will detach it from its parent.
       delete speech_button_;
       speech_button_ = NULL;
     }
   }
+  Layout();
 }
 
 void SearchBoxView::HintTextChanged() {
   search_box_->set_placeholder_text(model_->search_box()->hint_text());
 }
 
 void SearchBoxView::SelectionModelChanged() {
   search_box_->SelectSelectionModel(model_->search_box()->selection_model());
 }
 
 void SearchBoxView::TextChanged() {
   search_box_->SetText(model_->search_box()->text());
   NotifyQueryChanged();
 }
 
 void SearchBoxView::OnSpeechRecognitionStateChanged(
     SpeechRecognitionState new_state) {
   SpeechRecognitionButtonPropChanged();
   SchedulePaint();
 }
 
 }  // namespace app_list