ARIA role menuitemcheckbox, menuitemradio should have AXMenuItemMarkChar ✓.

content/browser/accessibility/browser_accessibility_cocoa.mm

Index: content/browser/accessibility/browser_accessibility_cocoa.mm
diff --git a/content/browser/accessibility/browser_accessibility_cocoa.mm b/content/browser/accessibility/browser_accessibility_cocoa.mm
index dc1c35fbad4b4c41242e3070a750aa89786beddf..5e5fcaaf1c9e6fef74e952864a6f0eac2ce4a0a8 100644
--- a/content/browser/accessibility/browser_accessibility_cocoa.mm
+++ b/content/browser/accessibility/browser_accessibility_cocoa.mm
@@ -115,6 +115,7 @@ NSDictionary* attributeToMethodNameMap = nil;
     { @"AXLoaded", @"loaded" },
     { @"AXLoadingProgress", @"loadingProgress" },
     { @"AXPlaceholder", @"placeholder" },
+    { @"AXMenuItemMarkChar", @"menuItemMarkChar"},
     { @"AXRequired", @"required" },
     { @"AXSortDirection", @"sortDirection" },
     { @"AXVisited", @"visited" },
@@ -494,6 +495,13 @@ NSDictionary* attributeToMethodNameMap = nil;
   return @"";
 }
 
+- (NSString*)menuItemMarkChar {
+  if (GetState(browserAccessibility_, ui::AX_STATE_CHECKED))
+    return @"\u2713";
+  else
+    return @"nil";
+}
+
 - (NSNumber*)numberOfCharacters {
   std::string value = browserAccessibility_->GetStringAttribute(
       ui::AX_ATTR_VALUE);
@@ -1388,6 +1396,10 @@ NSDictionary* attributeToMethodNameMap = nil;
         NSAccessibilitySelectedChildrenAttribute,
         NSAccessibilityVisibleChildrenAttribute,
         nil]];
+  } else if ([role isEqualToString:NSAccessibilityMenuItemRole]) {
+    [ret addObjectsFromArray:[NSArray arrayWithObjects:
+        @"AXMenuItemMarkChar",
+        nil]];
   }
 
   // Add the url attribute only if it has a valid url.