IME for Mus: Use ui::InputMethodChromeOS to provide logic for ime driver.

chrome/browser/ui/views/ime_driver/input_method_bridge_chromeos.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 "chrome/browser/ui/views/ime_driver/input_method_bridge_chromeos.h"
+
+#include "chrome/browser/ui/views/ime_driver/remote_text_input_client.h"
+
+InputMethodBridge::InputMethodBridge(ui::mojom::TextInputClientPtr client)
+    : client_(base::MakeUnique<RemoteTextInputClient>(std::move(client))),
+      input_method_chromeos_(
+          base::MakeUnique<ui::InputMethodChromeOS>(nullptr)) {
+  input_method_chromeos_->SetFocusedTextInputClient(client_.get());
+}
+
+InputMethodBridge::~InputMethodBridge() {}
+
+void InputMethodBridge::OnTextInputModeChanged(
+    ui::mojom::TextInputMode text_input_mode) {
+  // TODO(moshayedi): crbug.com/631527. Consider removing this, as
+  // ui::InputMethodChromeOS doesn't have this.
+}
+
+void InputMethodBridge::OnTextInputTypeChanged(
+    ui::mojom::TextInputType text_input_type) {
+  input_method_chromeos_->OnTextInputTypeChanged(client_.get());
+}
+
+void InputMethodBridge::OnCaretBoundsChanged(const gfx::Rect& caret_bounds) {
+  input_method_chromeos_->OnCaretBoundsChanged(client_.get());
+}
+
+void InputMethodBridge::ProcessKeyEvent(
+    std::unique_ptr<ui::Event> event,
+    const ProcessKeyEventCallback& callback) {
+  DCHECK(event->IsKeyEvent());
+  ui::KeyEvent* key_event = event->AsKeyEvent();
+  if (!key_event->is_char()) {
+    input_method_chromeos_->DispatchKeyEvent(
+        key_event, base::MakeUnique<base::Callback<void(bool)>>(callback));
+  } else {
+    callback.Run(false);
+  }
+}
+
+void InputMethodBridge::CancelComposition() {
+  input_method_chromeos_->CancelComposition(client_.get());
+}