Make NativeTextfieldViews update the win system caret.

ui/views/controls/textfield/native_textfield_views.h

Index: ui/views/controls/textfield/native_textfield_views.h
diff --git a/ui/views/controls/textfield/native_textfield_views.h b/ui/views/controls/textfield/native_textfield_views.h
index aad8dad8275be8faf865437d8e86c8686c5a745f..0870ec2cb50525a83926f5637761780b62e30974 100644
--- a/ui/views/controls/textfield/native_textfield_views.h
+++ b/ui/views/controls/textfield/native_textfield_views.h
@@ -288,6 +288,12 @@ class VIEWS_EXPORT NativeTextfieldViews : public View,
   // is -1, existing revealed index will be cleared.
   void RevealObscuredChar(int index, const base::TimeDelta& duration);
 
+  // Platform-specific updating of the system caret location to match ours.
+  void PlatformUpdateSystemCaret();
+
+  // Platform-specific hiding of the system caret whe we lose focus.
+  void PlatformHideSystemCaret();
+
   // The parent textfield, the owner of this object.
   Textfield* textfield_;
 
@@ -334,6 +340,9 @@ class VIEWS_EXPORT NativeTextfieldViews : public View,
   // and when the time expires, the last typed char is obscured.
   base::OneShotTimer<NativeTextfieldViews> obscured_reveal_timer_;
 
+  // The last caret rect, in screen coordinates.
+  gfx::Rect last_caret_rect_;
+
   DISALLOW_COPY_AND_ASSIGN(NativeTextfieldViews);
 };