Added a system caret used for accessibility on Windows.

ui/accessibility/platform/ax_fake_caret_win.cc

Index: ui/accessibility/platform/ax_fake_caret_win.cc
diff --git a/ui/accessibility/platform/ax_fake_caret_win.cc b/ui/accessibility/platform/ax_fake_caret_win.cc
index d15b1806066412456d7f7ab01055f90b26ea32b6..d9d28b1ab2ad7b05c264861bf9a8895e72009d77 100644
--- a/ui/accessibility/platform/ax_fake_caret_win.cc
+++ b/ui/accessibility/platform/ax_fake_caret_win.cc
@@ -20,8 +20,10 @@ AXFakeCaretWin::AXFakeCaretWin(gfx::AcceleratedWidget event_target)
   caret_ = static_cast<AXPlatformNodeWin*>(AXPlatformNodeWin::Create(this));
   data_.id = GetNextAXPlatformNodeUniqueId();
   data_.role = AX_ROLE_CARET;
+  // |get_accState| should return 0 which means that the caret is visible.
   data_.state = 0;
-  data_.SetName(L"caret");
+  // According to MSDN, "Edit" should be the name of the caret object.
+  data_.SetName(L"Edit");
   data_.offset_container_id = -1;
 }