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

chrome/browser/chromeos/input_method/mock_input_method_manager.h

Index: chrome/browser/chromeos/input_method/mock_input_method_manager.h
diff --git a/chrome/browser/chromeos/input_method/mock_input_method_manager.h b/chrome/browser/chromeos/input_method/mock_input_method_manager.h
index aeeaccd8677c6bdd1248e967f249d38e76380701..168de62a8e2cbd032c08a74a0ad2be2db3744c21 100644
--- a/chrome/browser/chromeos/input_method/mock_input_method_manager.h
+++ b/chrome/browser/chromeos/input_method/mock_input_method_manager.h
@@ -106,6 +106,8 @@ class MockInputMethodManager : public InputMethodManager {
       const std::string& engine_id,
       const std::vector<InputMethodManager::MenuItem>& items) override;
   void MaybeNotifyImeMenuActivationChanged() override;
+  void OverrideKeyboardUrlRef(const std::string& keyset) override;
+  bool IsEmojiHandwritingVoiceOnImeMenuEnabled() override;
 
   // Sets an input method ID which will be returned by GetCurrentInputMethod().
   void SetCurrentInputMethodId(const std::string& input_method_id);