IME for Mus: Make InputMethodMus use the IME Mojo API.

ui/views/mus/text_input_client_impl.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 "ui/views/mus/text_input_client_impl.h"
+
+#include "ui/base/ime/text_input_client.h"
+#include "ui/views/mus/input_method_mus.h"
+
+namespace views {
+
+TextInputClientImpl::TextInputClientImpl(ui::TextInputClient* text_input_client,
+                                         InputMethodMus* input_method)
+    : text_input_client_(text_input_client),
+      input_method_(input_method),
+      binding_(this) {}
+
+TextInputClientImpl::~TextInputClientImpl() {}
+
+ui::mojom::TextInputClientPtr TextInputClientImpl::CreateInterfacePtrAndBind() {
+  return binding_.CreateInterfacePtrAndBind();
+}
+
+void TextInputClientImpl::OnCompositionEvent(
+    ui::mojom::CompositionEventPtr event) {
+  switch (event->type) {
+    case ui::mojom::CompositionEventType::INSERT_CHAR: {
+      ui::KeyEvent* key_event = (*event->key_event)->AsKeyEvent();
+      if (key_event->is_char())

[sadrul, 2016/08/18 03:57:58]

This should be a DCHECK()? Why would we get INSERT_CHAR with a non-char event?

+        text_input_client_->InsertChar(*key_event);
+      break;
+    }
+    case ui::mojom::CompositionEventType::CONFIRM:
+      text_input_client_->ConfirmCompositionText();
+      break;
+    case ui::mojom::CompositionEventType::CLEAR:
+      text_input_client_->ClearCompositionText();
+      break;
+    case ui::mojom::CompositionEventType::UPDATE:
+    case ui::mojom::CompositionEventType::INSERT_TEXT:
+      // TODO(moshayedi): crbug.com/631524. Implement these types of composition
+      // events once we have the necessary fields in ui.mojom.CompositionEvent.
+      NOTIMPLEMENTED();
+      break;
+  }
+}
+
+void TextInputClientImpl::OnUnhandledEvent(
+    std::unique_ptr<ui::Event> key_event) {
+  DCHECK(key_event && key_event->IsKeyEvent());
+  input_method_->DispatchKeyEventPostIME(key_event->AsKeyEvent());

[sadrul, 2016/08/18 03:57:58]

Ideally, ui::TextInputClient would know how to deal with unprocessed key-events,
and this function would just forward |key_event| to |text_input_client_|. But
the unprocessed key-events go through the ui::InputMethod in chrome, so this is
OK for now.

+}
+
+}  // namespace views