Fire event on Mac when PRESSED state changes

content/browser/accessibility/browser_accessibility_manager_mac.mm

Index: content/browser/accessibility/browser_accessibility_manager_mac.mm
diff --git a/content/browser/accessibility/browser_accessibility_manager_mac.mm b/content/browser/accessibility/browser_accessibility_manager_mac.mm
index 37dd8faf47b197193b415c40b7b9785ebef175a7..c6b659b777bc5f6d505e75bb6b1e3233e9f4b5e4 100644
--- a/content/browser/accessibility/browser_accessibility_manager_mac.mm
+++ b/content/browser/accessibility/browser_accessibility_manager_mac.mm
@@ -405,6 +405,18 @@ void BrowserAccessibilityManagerMac::OnNodeDataWillChange(
   }
 }
 
+void BrowserAccessibilityManagerMac::OnStateChanged(ui::AXTree* tree,
+                                                    ui::AXNode* ax_node,
+                                                    ui::AXState state,
+                                                    bool new_value) {
+  if (state != ui::AX_STATE_PRESSED)
+    return;
+
+  BrowserAccessibility* node = GetFromID(ax_node->id());
+  NotifyAccessibilityEvent(BrowserAccessibilityEvent::FromTreeChange,
+                           ui::AX_EVENT_CHECKED_STATE_CHANGED, node);
+}
+
 NSDictionary* BrowserAccessibilityManagerMac::
     GetUserInfoForSelectedTextChangedNotification() {
   NSMutableDictionary* user_info = [[[NSMutableDictionary alloc] init]