Enables the 'hotword not listening' icon in the search box.

ui/app_list/search_box_model.cc

Index: ui/app_list/search_box_model.cc
diff --git a/ui/app_list/search_box_model.cc b/ui/app_list/search_box_model.cc
index cd884a7d20d61efae4e6413164bae6296ea574de..006c4b3f312b27e24908764d889ceba73f4d7243 100644
--- a/ui/app_list/search_box_model.cc
+++ b/ui/app_list/search_box_model.cc
@@ -9,14 +9,18 @@
 
 namespace app_list {
 
-SearchBoxModel::ButtonProperty::ButtonProperty(
-    const gfx::ImageSkia& icon,
-    const base::string16& tooltip)
-    : icon(icon),
-      tooltip(tooltip) {
+SearchBoxModel::SpeechButtonProperty::SpeechButtonProperty(
+    const gfx::ImageSkia& on_icon,
+    const base::string16& on_tooltip,
+    const gfx::ImageSkia& off_icon,
+    const base::string16& off_tooltip)
+    : on_icon(on_icon),
+      on_tooltip(on_tooltip),
+      off_icon(off_icon),
+      off_tooltip(off_tooltip) {
 }
 
-SearchBoxModel::ButtonProperty::~ButtonProperty() {
+SearchBoxModel::SpeechButtonProperty::~SpeechButtonProperty() {
 }
 
 SearchBoxModel::SearchBoxModel() {
@@ -31,7 +35,7 @@ void SearchBoxModel::SetIcon(const gfx::ImageSkia& icon) {
 }
 
 void SearchBoxModel::SetSpeechRecognitionButton(
-    scoped_ptr<SearchBoxModel::ButtonProperty> speech_button) {
+    scoped_ptr<SearchBoxModel::SpeechButtonProperty> speech_button) {
   speech_button_ = speech_button.Pass();
   FOR_EACH_OBSERVER(SearchBoxModelObserver,
                     observers_,