Adds the speech recognition button to the app-list searchbox.

ui/app_list/search_box_model.h

Index: ui/app_list/search_box_model.h
diff --git a/ui/app_list/search_box_model.h b/ui/app_list/search_box_model.h
index 764281fc869ada08d6674d6405abfbcf7ab2391f..4cb0b41f6aaa8ce462fbba2a8c5c6cb59e98e7f5 100644
--- a/ui/app_list/search_box_model.h
+++ b/ui/app_list/search_box_model.h
@@ -23,13 +23,37 @@ class SearchBoxModelObserver;
 // text, cursor position and selected text in edit control.
 class APP_LIST_EXPORT SearchBoxModel {
  public:
+  // The properties of the button with toggled status.
+  struct APP_LIST_EXPORT ToggleButtonProperty {
+    ToggleButtonProperty(const gfx::ImageSkia& icon,
+                         const gfx::ImageSkia& toggled_icon,
+                         const base::string16& tooltip,
+                         const base::string16& toggled_tooltip);
+    ~ToggleButtonProperty();
+
+    gfx::ImageSkia icon;
+    gfx::ImageSkia toggled_icon;
+    base::string16 tooltip;
+    base::string16 toggled_tooltip;
+  };
+
   SearchBoxModel();
   ~SearchBoxModel();
 
-  // Sets/gets the icon on side of edit box.
+  // Sets/gets the icon on the left side of edit box.
   void SetIcon(const gfx::ImageSkia& icon);
   const gfx::ImageSkia& icon() const { return icon_; }
 
+  // Sets/gets the properties for the button of speech recognition.
+  void SetSpeechRecognitionButton(
+      scoped_ptr<ToggleButtonProperty> speech_button);
+  const ToggleButtonProperty* speech_button() const {
+    return speech_button_.get();
+  }
+
+  // Sets the speech recognition button state.
+  void SetSpeechRecognitionButtonState(bool toggled);
+
   // Sets/gets the hint text to display when there is in input.
   void SetHintText(const base::string16& hint_text);
   const base::string16& hint_text() const { return hint_text_; }
@@ -49,6 +73,7 @@ class APP_LIST_EXPORT SearchBoxModel {
 
  private:
   gfx::ImageSkia icon_;
+  scoped_ptr<ToggleButtonProperty> speech_button_;
   base::string16 hint_text_;
   gfx::SelectionModel selection_model_;
   base::string16 text_;