Added a class acting as a fake caret for accessibility.

ui/views/widget/desktop_aura/desktop_window_tree_host_win.h

 // Copyright (c) 2012 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 UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_WIN_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_WIN_H_
 
 #include "base/macros.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/views/views_export.h"
@@ skipping 114 matching lines @@
   void MoveCursorToScreenLocationInPixels(
       const gfx::Point& location_in_pixels) override;
 
   // Overridden from aura::client::AnimationHost
   void SetHostTransitionOffsets(
       const gfx::Vector2d& top_left_delta,
       const gfx::Vector2d& bottom_right_delta) override;
   void OnWindowHidingAnimationCompleted() override;
 
   // Overridden from HWNDMessageHandlerDelegate:
+  void AddInputMethodObserver() const override;
+  void RemoveInputMethodObserver() const override;
   bool HasNonClientView() const override;
   FrameMode GetFrameMode() const override;
   bool HasFrame() const override;
   void SchedulePaint() override;
   void SetAlwaysRenderAsActive(bool always_render_as_active) override;
   bool IsAlwaysRenderAsActive() override;
   bool CanResize() const override;
   bool CanMaximize() const override;
   bool CanMinimize() const override;
   bool CanActivate() const override;
@@ skipping 126 matching lines @@
   // Indicates if current window will receive mouse events when should not
   // become activated.
   bool wants_mouse_events_when_inactive_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopWindowTreeHostWin);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_WIN_H_