Make NativeTextfieldViews update the win system caret.

ui/base/win/accessibility_misc_utils.cc

Index: ui/base/win/accessibility_misc_utils.cc
diff --git a/ui/base/win/accessibility_misc_utils.cc b/ui/base/win/accessibility_misc_utils.cc
index 5074ce372a7999676e33c31c61a97dd09e8de279..c3a76002cecf9505690abf9f293a1c3d1151d9e1 100644
--- a/ui/base/win/accessibility_misc_utils.cc
+++ b/ui/base/win/accessibility_misc_utils.cc
@@ -9,6 +9,23 @@
 namespace base {
 namespace win {
 
+void SetInvisibleSystemCaretRect(HWND hwnd, gfx::Rect caret_rect) {
+  // Create an invisible bitmap.
+  HBITMAP caret_bitmap = CreateBitmap(1, caret_rect.height(), 1, 1, NULL);
+
+  // This destroys the previous caret (no matter what window it belonged to)
+  // and creates a new one owned by this window.
+  if (!CreateCaret(hwnd, caret_bitmap, 1, caret_rect.height()))
+    return;
+
+  ShowCaret(hwnd);
+  RECT window_rect;
+  GetWindowRect(hwnd, &window_rect);
+  SetCaretPos(caret_rect.x() - window_rect.left + 2,
+              caret_rect.y() - window_rect.top + 2);
+  DeleteObject(caret_bitmap);

[sky, 2013/11/07 01:34:42]

Does caret_bitmap leak if CreateCaret returns false? Also, don't we have some
scoper you can use?

[dmazzoni, 2013/11/07 20:07:14]

Good catch, done.

+}
+
 // UIA TextProvider implementation.
 UIATextProvider::UIATextProvider()
     : editable_(false) {}