Test aria-pressed=mixed on windows

third_party/WebKit/Source/modules/accessibility/InspectorAccessibilityAgent.cpp

Index: third_party/WebKit/Source/modules/accessibility/InspectorAccessibilityAgent.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/InspectorAccessibilityAgent.cpp b/third_party/WebKit/Source/modules/accessibility/InspectorAccessibilityAgent.cpp
index 090379f4bb2021e8b6acfce208042521867bbc73..e6e0357f862855ea1964acd32d751042a3b816fd 100644
--- a/third_party/WebKit/Source/modules/accessibility/InspectorAccessibilityAgent.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/InspectorAccessibilityAgent.cpp
@@ -290,22 +290,14 @@ void FillWidgetStates(AXObjectImpl& ax_object,
   }
 
   if (role == kToggleButtonRole) {
-    if (!ax_object.IsPressed()) {
-      properties.addItem(
-          CreateProperty(AXWidgetStatesEnum::Pressed,
-                         CreateValue("false", AXValueTypeEnum::Tristate)));
-    } else {
-      const AtomicString& pressed_attr =
-          ax_object.GetAttribute(HTMLNames::aria_pressedAttr);
-      if (EqualIgnoringASCIICase(pressed_attr, "mixed"))
-        properties.addItem(
-            CreateProperty(AXWidgetStatesEnum::Pressed,
-                           CreateValue("mixed", AXValueTypeEnum::Tristate)));
-      else
-        properties.addItem(
-            CreateProperty(AXWidgetStatesEnum::Pressed,
-                           CreateValue("true", AXValueTypeEnum::Tristate)));
-    }
+    const AccessibilityButtonState pressed = ax_object.PressedState();
+    const char* pressed_str =
+        pressed == kButtonStateOn
+            ? "true"
+            : (pressed == kButtonStateMixed ? "mixed" : "false");
+    properties.addItem(
+        CreateProperty(AXWidgetStatesEnum::Pressed,
+                       CreateValue(pressed_str, AXValueTypeEnum::Tristate)));
   }
 
   if (RoleAllowsSelected(role)) {