Scroll IME list to visible when using tab key.

ash/common/system/chromeos/ime_menu/ime_list_view.cc

Index: ash/common/system/chromeos/ime_menu/ime_list_view.cc
diff --git a/ash/common/system/chromeos/ime_menu/ime_list_view.cc b/ash/common/system/chromeos/ime_menu/ime_list_view.cc
index ff3caab9604440a7c22e0ed33512b40d5893bcae..1452eeb447d518398a7e8a9e0cff73c60718c128 100644
--- a/ash/common/system/chromeos/ime_menu/ime_list_view.cc
+++ b/ash/common/system/chromeos/ime_menu/ime_list_view.cc
@@ -144,6 +144,12 @@ class ImeListItemView : public ActionableView {
     return true;
   }
 
+  void OnFocus() override {
+    ActionableView::OnFocus();
+    if (ime_list_view_ && ime_list_view_->scroll_content())
+      ime_list_view_->scroll_content()->ScrollRectToVisible(bounds());
+  }
+
   // views::View:
   void OnNativeThemeChanged(const ui::NativeTheme* theme) override {
     UpdateStyle();