Make NativeTextfieldViews update the win system caret.

ui/base/win/accessibility_misc_utils.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_BASE_WIN_ACCESSIBILITY_MISC_UTILS_H_
 #define UI_BASE_WIN_ACCESSIBILITY_MISC_UTILS_H_
 
 #include <atlbase.h>
 #include <atlcom.h>
 #include <UIAutomationCore.h>
 
 #include "base/compiler_specific.h"
 #include "ui/base/ui_export.h"
+#include "ui/gfx/rect.h"
 
 namespace base {
 namespace win {
 
-  // UIA Text provider implementation for edit controls.
+// This is used when we draw our own caret. Updates the system caret rect
+// to the given bounding rectangle but makes it invisible. This allows
+// utilities that help the user find the system caret to continue to work.
+// |hwnd| should be the owning window, and |caret_rect| is in global
+// screen coordinates.
+UI_EXPORT void SetInvisibleSystemCaretRect(HWND hwnd,
+                                           const gfx::Rect& caret_rect);
+
+// UIA Text provider implementation for edit controls.
 class UI_EXPORT UIATextProvider
     : public NON_EXPORTED_BASE(CComObjectRootEx<CComMultiThreadModel>),
       public IValueProvider,
       public ITextProvider {
  public:
   BEGIN_COM_MAP(UIATextProvider)
     COM_INTERFACE_ENTRY2(IUnknown, ITextProvider)
     COM_INTERFACE_ENTRY(IValueProvider)
     COM_INTERFACE_ENTRY(ITextProvider)
   END_COM_MAP()
@@ skipping 54 matching lines @@
   }
 
  private:
   bool editable_;
 };
 
 }  // win
 }  // base
 
 #endif  // UI_BASE_WIN_ACCESSIBILITY_MISC_UTILS_H_