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

services/ui/ime/test_ime_driver/test_ime_driver.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 "services/ui/ime/test_ime_driver/test_ime_driver.h"
 
 #include "services/ui/public/interfaces/ime.mojom.h"
 
 namespace ui {
 namespace test {
 
 class TestInputMethod : public mojom::InputMethod {
  public:
   explicit TestInputMethod(mojom::TextInputClientPtr client)
       : client_(std::move(client)) {}
   ~TestInputMethod() override {}
 
  private:
   // mojom::InputMethod:
   void OnTextInputModeChanged(mojom::TextInputMode text_input_mode) override {}
   void OnTextInputTypeChanged(mojom::TextInputType text_input_type) override {}
   void OnCaretBoundsChanged(const gfx::Rect& caret_bounds) override {}
-  void ProcessKeyEvent(std::unique_ptr<Event> key_event) override {
+  void ProcessKeyEvent(std::unique_ptr<Event> key_event,
+                       const ProcessKeyEventCallback& callback) override {
     DCHECK(key_event->IsKeyEvent());
 
     if (key_event->AsKeyEvent()->is_char()) {
       mojom::CompositionEventPtr composition_event =
           mojom::CompositionEvent::New();
       composition_event->type = mojom::CompositionEventType::INSERT_CHAR;
       composition_event->key_event = std::move(key_event);
       client_->OnCompositionEvent(std::move(composition_event));
+      callback.Run(true);
     } else {
-      client_->OnUnhandledEvent(std::move(key_event));
+      callback.Run(false);
     }
-  };
+  }
   void CancelComposition() override {}
 
   mojom::TextInputClientPtr client_;
 
   DISALLOW_COPY_AND_ASSIGN(TestInputMethod);
 };
 
 TestIMEDriver::TestIMEDriver() {}
 
 TestIMEDriver::~TestIMEDriver() {}
 
 void TestIMEDriver::StartSession(
     int32_t session_id,
     mojom::TextInputClientPtr client,
     mojom::InputMethodRequest input_method_request) {
   input_method_bindings_[session_id].reset(
       new mojo::Binding<mojom::InputMethod>(
           new TestInputMethod(std::move(client)),
           std::move(input_method_request)));
 }
 
 void TestIMEDriver::CancelSession(int32_t session_id) {
   input_method_bindings_.erase(session_id);
 }
 
 }  // namespace test
 }  // namespace ui