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

ui/app_list/views/search_box_view.cc

Index: ui/app_list/views/search_box_view.cc
diff --git a/ui/app_list/views/search_box_view.cc b/ui/app_list/views/search_box_view.cc
index f7a84f43654ac7b1b77e928148883a0f7efee783..aee2c2f0edd9f5a732f50e65b66fdb3efe32f8cb 100644
--- a/ui/app_list/views/search_box_view.cc
+++ b/ui/app_list/views/search_box_view.cc
@@ -10,6 +10,7 @@
 #include "ui/app_list/app_list_model.h"
 #include "ui/app_list/app_list_view_delegate.h"
 #include "ui/app_list/search_box_model.h"
+#include "ui/app_list/speech_ui_model.h"
 #include "ui/app_list/views/app_list_menu_views.h"
 #include "ui/app_list/views/contents_view.h"
 #include "ui/app_list/views/search_box_view_delegate.h"
@@ -70,10 +71,12 @@ SearchBoxView::SearchBoxView(SearchBoxViewDelegate* delegate,
   search_box_->set_controller(this);
   AddChildView(search_box_);
 
+  view_delegate_->GetSpeechUI()->AddObserver(this);
   ModelChanged();
 }
 
 SearchBoxView::~SearchBoxView() {
+  view_delegate_->GetSpeechUI()->RemoveObserver(this);
   model_->search_box()->RemoveObserver(this);
 }
 
@@ -210,16 +213,24 @@ void SearchBoxView::IconChanged() {
 }
 
 void SearchBoxView::SpeechRecognitionButtonPropChanged() {
-  const SearchBoxModel::ButtonProperty* speech_button_prop =
+  const SearchBoxModel::SpeechButtonProperty* speech_button_prop =
       model_->search_box()->speech_button();
   if (speech_button_prop) {
     if (!speech_button_) {
       speech_button_ = new views::ImageButton(this);
       AddChildView(speech_button_);
     }
-    speech_button_->SetImage(views::Button::STATE_NORMAL,
-                            &speech_button_prop->icon);
-    speech_button_->SetTooltipText(speech_button_prop->tooltip);
+
+    if (view_delegate_->GetSpeechUI()->state() ==
+        SPEECH_RECOGNITION_HOTWORD_LISTENING) {
+      speech_button_->SetImage(
+          views::Button::STATE_NORMAL, &speech_button_prop->on_icon);
+      speech_button_->SetTooltipText(speech_button_prop->on_tooltip);
+    } else {
+      speech_button_->SetImage(
+          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.
@@ -242,4 +253,10 @@ void SearchBoxView::TextChanged() {
   NotifyQueryChanged();
 }
 
+void SearchBoxView::OnSpeechRecognitionStateChanged(
+    SpeechRecognitionState new_state) {
+  SpeechRecognitionButtonPropChanged();
+  SchedulePaint();
+}
+
 }  // namespace app_list