Show IME in opt-in menu when there's one IME.

ash/common/system/chromeos/ime_menu/ime_menu_tray.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_menu_tray.h"
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/ash_constants.h"
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/session/session_state_delegate.h"
@@ skipping 32 matching lines @@
 #include "ui/views/layout/box_layout.h"
 
 using chromeos::input_method::InputMethodManager;
 
 namespace ash {
 
 namespace {
 // Returns the height range of ImeListView.
 gfx::Range GetImeListViewRange() {
   const int max_items = 5;
-  const int min_items = 2;
+  const int min_items = 1;
   const int tray_item_height = GetTrayConstant(TRAY_POPUP_ITEM_MIN_HEIGHT);
   return gfx::Range(tray_item_height * min_items, tray_item_height * max_items);
 }
 
 // Returns the minimum with of IME menu.
 int GetMinimumMenuWidth() {
   return MaterialDesignController::IsSystemTrayMenuMaterial()
              ? kTrayMenuMinimumWidthMd
              : kTrayMenuMinimumWidth;
 }
@@ skipping 235 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ImeButtonsView);
 };
 
 // The list view that contains the selected IME and property items.
 class ImeMenuListView : public ImeListView {
  public:
   ImeMenuListView(SystemTrayItem* owner,
                   bool show_keyboard_toggle,
                   SingleImeBehavior single_ime_behavior)
-      : ImeListView(owner, show_keyboard_toggle, ImeListView::HIDE_SINGLE_IME) {
+      : ImeListView(owner, show_keyboard_toggle, single_ime_behavior) {
     set_should_focus_ime_after_selection_with_keyboard(true);
   }
 
   ~ImeMenuListView() override {}
 
  protected:
   void Layout() override {
     gfx::Range height_range = GetImeListViewRange();
     if (MaterialDesignController::IsSystemTrayMenuMaterial()) {
       scroller()->ClipHeightTo(height_range.start(), height_range.end());
@@ skipping 267 matching lines @@
   WmShell::Get()->system_tray_delegate()->GetCurrentIME(&current_ime_);
 
   // Updates the tray label based on the current input method.
   if (current_ime_.third_party)
     label_->SetText(current_ime_.short_name + base::UTF8ToUTF16("*"));
   else
     label_->SetText(current_ime_.short_name);
 }
 
 }  // namespace ash