Make DispatchKeyEventPostIME() asynchronous.

ui/aura/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/aura/mus/text_input_client_impl.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/aura/mus/input_method_mus.h"
 #include "ui/base/ime/text_input_client.h"
 
 namespace aura {
 
-TextInputClientImpl::TextInputClientImpl(ui::TextInputClient* text_input_client)
-    : text_input_client_(text_input_client), binding_(this) {}
+TextInputClientImpl::TextInputClientImpl(
+    ui::TextInputClient* text_input_client,
+    ui::internal::InputMethodDelegate* delegate)
+    : text_input_client_(text_input_client),
+      binding_(this),
+      delegate_(delegate) {}
 
 TextInputClientImpl::~TextInputClientImpl() {}
 
 ui::mojom::TextInputClientPtr TextInputClientImpl::CreateInterfacePtrAndBind() {
   ui::mojom::TextInputClientPtr ptr;
   binding_.Bind(mojo::MakeRequest(&ptr));
   return ptr;
 }
 
 void TextInputClientImpl::SetCompositionText(
@@ skipping 11 matching lines @@
 
 void TextInputClientImpl::InsertText(const std::string& text) {
   text_input_client_->InsertText(base::UTF8ToUTF16(text));
 }
 
 void TextInputClientImpl::InsertChar(std::unique_ptr<ui::Event> event) {
   DCHECK(event->IsKeyEvent());
   text_input_client_->InsertChar(*event->AsKeyEvent());
 }
 
+void TextInputClientImpl::DispatchKeyEventPostIME(
+    std::unique_ptr<ui::Event> event,
+    const DispatchKeyEventPostIMECallback& callback) {
+  if (delegate_) {
+    delegate_->DispatchKeyEventPostIME(
+        event->AsKeyEvent(),
+        base::MakeUnique<DispatchKeyEventPostIMECallback>(callback));
+  }
+}
+
 }  // namespace aura