Mac: Add new accessibility attributes for textfields (and some for all views).

ui/views/accessibility/native_view_accessibility.cc

Index: ui/views/accessibility/native_view_accessibility.cc
diff --git a/ui/views/accessibility/native_view_accessibility.cc b/ui/views/accessibility/native_view_accessibility.cc
index ab86be128e34ba269b12e339be1725abae1e4016..0cdec0d150397aec2813046df89fb1e840bc32c4 100644
--- a/ui/views/accessibility/native_view_accessibility.cc
+++ b/ui/views/accessibility/native_view_accessibility.cc
@@ -63,6 +63,8 @@ const ui::AXNodeData& NativeViewAccessibility::GetData() {
                            base::UTF16ToUTF8(state.default_action));
   data_.AddStringAttribute(ui::AX_ATTR_SHORTCUT,
                            base::UTF16ToUTF8(state.keyboard_shortcut));
+  data_.AddStringAttribute(ui::AX_ATTR_PLACEHOLDER,
+                           base::UTF16ToUTF8(state.placeholder));
   data_.AddIntAttribute(ui::AX_ATTR_TEXT_SEL_START, state.selection_start);
   data_.AddIntAttribute(ui::AX_ATTR_TEXT_SEL_END, state.selection_end);