Add action for each button on opt-in IME menu.

components/arc/ime/arc_ime_service.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 "components/arc/ime/arc_ime_service.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 161 matching lines @@
 void ArcImeService::OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) {
   if (focused_arc_window_.windows().empty())
     return;
   aura::Window* window = focused_arc_window_.windows().front();
   // Multiply by the scale factor. To convert from DPI to physical pixels.
   gfx::Rect bounds_in_px = gfx::ScaleToEnclosingRect(
       new_bounds, window->layer()->device_scale_factor());
   ime_bridge_->SendOnKeyboardBoundsChanging(bounds_in_px);
 }
 
+void ArcImeService::OnKeyboardHidden() {}
+
 ////////////////////////////////////////////////////////////////////////////////
 // Overridden from ui::TextInputClient:
 
 void ArcImeService::SetCompositionText(
     const ui::CompositionText& composition) {
   has_composition_text_ = !composition.text.empty();
   ime_bridge_->SendSetCompositionText(composition);
 }
 
 void ArcImeService::ConfirmCompositionText() {
@@ skipping 133 matching lines @@
     base::i18n::TextDirection direction) {
   return false;
 }
 
 bool ArcImeService::IsTextEditCommandEnabled(
     ui::TextEditCommand command) const {
   return false;
 }
 
 }  // namespace arc