Make DispatchKeyEventPostIME() asynchronous.

chrome/browser/ui/views/ime_driver/remote_text_input_client.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_IME_DRIVER_REMOTE_TEXT_INPUT_CLIENT_H_
 #define CHROME_BROWSER_UI_VIEWS_IME_DRIVER_REMOTE_TEXT_INPUT_CLIENT_H_
 
 #include "services/ui/public/interfaces/ime/ime.mojom.h"
+#include "ui/base/ime/input_method_delegate.h"
 #include "ui/base/ime/text_input_client.h"
 
 // This implementation of ui::TextInputClient sends all updates via mojo IPC to
 // a remote client. This is intended to be passed to the overrides of
 // ui::InputMethod::SetFocusedTextInputClient().
-class RemoteTextInputClient : public ui::TextInputClient {
+class RemoteTextInputClient : public ui::TextInputClient,
+                              public ui::internal::InputMethodDelegate {
  public:
   RemoteTextInputClient(ui::mojom::TextInputClientPtr remote_client,
                         ui::TextInputType text_input_type,
                         ui::TextInputMode text_input_mode,
                         base::i18n::TextDirection text_direction,
                         int text_input_flags,
                         gfx::Rect caret_bounds);
   ~RemoteTextInputClient() override;
 
   void SetTextInputType(ui::TextInputType text_input_type);
@@ skipping 23 matching lines @@
   bool GetTextFromRange(const gfx::Range& range,
                         base::string16* text) const override;
   void OnInputMethodChanged() override;
   bool ChangeTextDirectionAndLayoutAlignment(
       base::i18n::TextDirection direction) override;
   void ExtendSelectionAndDelete(size_t before, size_t after) override;
   void EnsureCaretNotInRect(const gfx::Rect& rect) override;
   bool IsTextEditCommandEnabled(ui::TextEditCommand command) const override;
   void SetTextEditCommandForNextKeyEvent(ui::TextEditCommand command) override;
 
+  // ui::internal::InputMethodDelegate:
+  ui::EventDispatchDetails DispatchKeyEventPostIME(
+      ui::KeyEvent* event) override;
+  ui::EventDispatchDetails DispatchKeyEventPostIME(
+      ui::KeyEvent* key_event,
+      std::unique_ptr<base::Callback<void(bool)>> ack_callback) override;
+
+  void DispatchKeyEventPostIMECallback(bool stopped_propagation);
+
   ui::mojom::TextInputClientPtr remote_client_;
   ui::TextInputType text_input_type_;
   ui::TextInputMode text_input_mode_;
   base::i18n::TextDirection text_direction_;
   int text_input_flags_;
   gfx::Rect caret_bounds_;
+  std::deque<std::unique_ptr<base::Callback<void(bool)>>> pending_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteTextInputClient);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_IME_DRIVER_REMOTE_TEXT_INPUT_CLIENT_H_