Test aria-pressed=mixed on windows

content/renderer/accessibility/blink_ax_tree_source.cc

Index: content/renderer/accessibility/blink_ax_tree_source.cc
diff --git a/content/renderer/accessibility/blink_ax_tree_source.cc b/content/renderer/accessibility/blink_ax_tree_source.cc
index 2a61ac2f9424823c671c85da4b42ef8d2dccafae..eb1247dc68afa07ed1b570e6a6f85b9e8ac5a3c7 100644
--- a/content/renderer/accessibility/blink_ax_tree_source.cc
+++ b/content/renderer/accessibility/blink_ax_tree_source.cc
@@ -494,9 +494,15 @@ void BlinkAXTreeSource::SerializeNode(blink::WebAXObject src,
     }
 
     if (src.IsCheckable()) {
-      const blink::WebAXCheckedState checked_state = src.CheckedState();
+      const blink::WebAXButtonState checked_state = src.CheckedState();
       dst->AddIntAttribute(ui::AX_ATTR_CHECKED_STATE,
-                           AXCheckedStateFromBlink(checked_state));
+                           AXButtonStateFromBlink(checked_state));
+    }
+
+    if (dst->role == ui::AX_ROLE_TOGGLE_BUTTON) {
+      const blink::WebAXButtonState pressed_state = src.PressedState();
+      dst->AddIntAttribute(ui::AX_ATTR_PRESSED_STATE,
+                           AXButtonStateFromBlink(pressed_state));
     }
 
     if (src.GetTextDirection()) {