Scroll IME list to visible when using tab key.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/system/chromeos/ime_menu/ime_list_view.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/system/tray/hover_highlight_view.h"
 #include "ash/common/system/tray/ime_info.h"
 #include "ash/common/system/tray/system_menu_button.h"
@@ skipping 126 matching lines @@
   }
 
   ~ImeListItemView() override {}
 
   // ActionableView:
   bool PerformAction(const ui::Event& event) override {
     ime_list_view_->HandleViewClicked(this);
     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();
   }
 
   void GetAccessibleNodeData(ui::AXNodeData* node_data) override {
     ActionableView::GetAccessibleNodeData(node_data);
     node_data->role = ui::AX_ROLE_CHECK_BOX;
     node_data->AddStateFlag(selected_ ? ui::AX_STATE_CHECKED
                                       : ui::AX_STATE_NONE);
@@ skipping 249 matching lines @@
 
 void ImeListView::HandleButtonPressed(views::Button* sender,
                                       const ui::Event& event) {
   if (material_keyboard_status_view_ &&
       sender == material_keyboard_status_view_->toggle()) {
     WmShell::Get()->ToggleIgnoreExternalKeyboard();
   }
 }
 
 }  // namespace ash