IME for Mus: Send ack for key events after IME driver processes the event.

ui/views/mus/input_method_mus.h

 // Copyright (c) 2015 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 "ui/base/ime/input_method_base.h"
 
 #ifndef UI_VIEWS_MUS_INPUT_METHOD_MUS_H_
 #define UI_VIEWS_MUS_INPUT_METHOD_MUS_H_
 
 #include "base/macros.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "services/service_manager/public/cpp/connector.h"
 #include "services/ui/public/interfaces/ime.mojom.h"
 #include "ui/views/mus/mus_export.h"
 
 namespace ui {
 class Window;
-}  // namespace mojo
+namespace mojom {
+enum class EventResult;
+}  // namespace mojom
+}  // namespace ui
 
 namespace views {
 
 class TextInputClientImpl;
 
 class VIEWS_MUS_EXPORT InputMethodMus : public ui::InputMethodBase {
  public:
   InputMethodMus(ui::internal::InputMethodDelegate* delegate,
                  ui::Window* window);
   ~InputMethodMus() override;
 
   void Init(service_manager::Connector* connector);
+  void DispatchKeyEvent(
+      ui::KeyEvent* event,
+      std::unique_ptr<base::Callback<void(ui::mojom::EventResult)>>
+          ack_callback);
 
   // Overridden from ui::InputMethod:
   void OnFocus() override;
   void OnBlur() override;
   bool OnUntranslatedIMEMessage(const base::NativeEvent& event,
                                 NativeEventResult* result) override;
   void DispatchKeyEvent(ui::KeyEvent* event) override;
   void OnTextInputTypeChanged(const ui::TextInputClient* client) override;
   void OnCaretBoundsChanged(const ui::TextInputClient* client) override;
   void CancelComposition(const ui::TextInputClient* client) override;
   void OnInputLocaleChanged() override;
   bool IsCandidatePopupOpen() const override;
 
  private:
   friend TextInputClientImpl;
 
   // Overridden from ui::InputMethodBase:
   void OnDidChangeFocusedClient(ui::TextInputClient* focused_before,
                                 ui::TextInputClient* focused) override;
 
   void UpdateTextInputType();
+  void ProcessKeyEventCallback(
+      const ui::KeyEvent& event,
+      std::unique_ptr<base::Callback<void(ui::mojom::EventResult)>>
+          ack_callback,
+      bool handled);
 
   // The toplevel window which is not owned by this class. This may be null
   // for tests.
   ui::Window* window_;
 
   ui::mojom::IMEServerPtr ime_server_;
   ui::mojom::InputMethodPtr input_method_;
   std::unique_ptr<TextInputClientImpl> text_input_client_;
 
   DISALLOW_COPY_AND_ASSIGN(InputMethodMus);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_MUS_INPUT_METHOD_MUS_H_