ARIA state/property aria-autocomplete should expose IA2_STATE_SUPPORTS_AUTOCOMPLETION.

content/browser/accessibility/browser_accessibility_win.cc

Index: content/browser/accessibility/browser_accessibility_win.cc
diff --git a/content/browser/accessibility/browser_accessibility_win.cc b/content/browser/accessibility/browser_accessibility_win.cc
index a6173c2e63e20fb716facdb1ff4d6a4837382a5c..9ea39a761d590fa3db21cc480779ad55111a12ce 100644
--- a/content/browser/accessibility/browser_accessibility_win.cc
+++ b/content/browser/accessibility/browser_accessibility_win.cc
@@ -2909,6 +2909,9 @@ void BrowserAccessibilityWin::OnDataChanged() {
 
   InitRoleAndState();
 
+  // Expose autocomplete attribute for combobox and textbox.
+  StringAttributeToIA2(ui::AX_ATTR_AUTO_COMPLETE, "autocomplete");
+
   // Expose the "display" and "tag" attributes.
   StringAttributeToIA2(ui::AX_ATTR_DISPLAY, "display");
   StringAttributeToIA2(ui::AX_ATTR_TEXT_INPUT_TYPE, "text-input-type");
@@ -3380,6 +3383,9 @@ void BrowserAccessibilityWin::InitRoleAndState() {
   if (GetBoolAttribute(ui::AX_ATTR_CAN_SET_VALUE))
     ia2_state_ |= IA2_STATE_EDITABLE;
 
+  if (!GetStringAttribute(ui::AX_ATTR_AUTO_COMPLETE).empty())
+    ia2_state_ |= IA2_STATE_SUPPORTS_AUTOCOMPLETION;
+
   base::string16 html_tag = GetString16Attribute(
       ui::AX_ATTR_HTML_TAG);
   ia_role_ = 0;