Implement UIElementsForSearchPredicate accessibility APIs for OS X.

content/browser/accessibility/browser_accessibility.cc

Index: content/browser/accessibility/browser_accessibility.cc
diff --git a/content/browser/accessibility/browser_accessibility.cc b/content/browser/accessibility/browser_accessibility.cc
index 0fdad54c91c4ef45eac37bfd034aba1e3c644049..e6aea32050a57a1a865b768e151035e9cb38cef2 100644
--- a/content/browser/accessibility/browser_accessibility.cc
+++ b/content/browser/accessibility/browser_accessibility.cc
@@ -759,6 +759,38 @@ bool BrowserAccessibility::IsWebAreaForPresentationalIframe() const {
   return grandparent->GetRole() == ui::AX_ROLE_IFRAME_PRESENTATIONAL;
 }
 
+bool BrowserAccessibility::IsControl() const {
+  switch (GetRole()) {
+    case ui::AX_ROLE_BUTTON:
+    case ui::AX_ROLE_BUTTON_DROP_DOWN:
+    case ui::AX_ROLE_CHECK_BOX:
+    case ui::AX_ROLE_COLOR_WELL:
+    case ui::AX_ROLE_COMBO_BOX:
+    case ui::AX_ROLE_DISCLOSURE_TRIANGLE:
+    case ui::AX_ROLE_LIST_BOX:
+    case ui::AX_ROLE_MENU_BAR:
+    case ui::AX_ROLE_MENU_BUTTON:
+    case ui::AX_ROLE_MENU_ITEM:
+    case ui::AX_ROLE_MENU_ITEM_CHECK_BOX:
+    case ui::AX_ROLE_MENU_ITEM_RADIO:
+    case ui::AX_ROLE_MENU:
+    case ui::AX_ROLE_POP_UP_BUTTON:
+    case ui::AX_ROLE_RADIO_BUTTON:
+    case ui::AX_ROLE_SCROLL_BAR:
+    case ui::AX_ROLE_SEARCH_BOX:
+    case ui::AX_ROLE_SLIDER:
+    case ui::AX_ROLE_SPIN_BUTTON:
+    case ui::AX_ROLE_SWITCH:
+    case ui::AX_ROLE_TAB:
+    case ui::AX_ROLE_TEXT_FIELD:
+    case ui::AX_ROLE_TOGGLE_BUTTON:
+    case ui::AX_ROLE_TREE:
+      return true;
+    default:
+      return false;
+  }
+}
+
 int BrowserAccessibility::GetStaticTextLenRecursive() const {
   if (GetRole() == ui::AX_ROLE_STATIC_TEXT ||
       GetRole() == ui::AX_ROLE_LINE_BREAK) {