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

ui/app_list/cocoa/apps_search_box_controller.mm

Index: ui/app_list/cocoa/apps_search_box_controller.mm
diff --git a/ui/app_list/cocoa/apps_search_box_controller.mm b/ui/app_list/cocoa/apps_search_box_controller.mm
index 93a96cb63c127e5abedf7081698299d82d10b349..803b9f3c2b7499298a4b52ff4b47f88659bbe94f 100644
--- a/ui/app_list/cocoa/apps_search_box_controller.mm
+++ b/ui/app_list/cocoa/apps_search_box_controller.mm
@@ -53,6 +53,8 @@ class SearchBoxModelObserverBridge : public SearchBoxModelObserver {
   void SetSearchText(const base::string16& text);
 
   virtual void IconChanged() OVERRIDE;
+  virtual void RightButtonPropChanged() OVERRIDE;
+  virtual void RightButtonStateChanged(bool toggled) OVERRIDE;
   virtual void HintTextChanged() OVERRIDE;
   virtual void SelectionModelChanged() OVERRIDE;
   virtual void TextChanged() OVERRIDE;
@@ -96,6 +98,16 @@ void SearchBoxModelObserverBridge::IconChanged() {
       GetModel()->icon(), base::mac::GetSRGBColorSpace())];
 }
 
+void SearchBoxModelObserverBridge::RightButtonPropChanged() {
+  // TODO(mukai): implement.
+  NOTIMPLEMENTED();
+}
+
+void SearchBoxModelObserverBridge::RightButtonStateChanged(bool toggled) {
+  // TODO(mukai): implement.
+  NOTIMPLEMENTED();
+}
+
 void SearchBoxModelObserverBridge::HintTextChanged() {
   [[[parent_ searchTextField] cell] setPlaceholderString:
       base::SysUTF16ToNSString(GetModel()->hint_text())];