Implement UIElementsForSearchPredicate accessibility APIs for OS X.

content/browser/accessibility/browser_accessibility.h

Index: content/browser/accessibility/browser_accessibility.h
diff --git a/content/browser/accessibility/browser_accessibility.h b/content/browser/accessibility/browser_accessibility.h
index 4f6b308619dc7983ae7d12d4d111ef9fa1b7dd7c..643e5950d5a485afbea2450a8fb6224ada79a7f6 100644
--- a/content/browser/accessibility/browser_accessibility.h
+++ b/content/browser/accessibility/browser_accessibility.h
@@ -173,7 +173,6 @@ class CONTENT_EXPORT BrowserAccessibility {
   typedef base::StringPairs HtmlAttributes;
   const HtmlAttributes& GetHtmlAttributes() const;
 
-
   // Returns true if this is a native platform-specific object, vs a
   // cross-platform generic object. Don't call ToBrowserAccessibilityXXX if
   // IsNative returns false.
@@ -262,6 +261,9 @@ class CONTENT_EXPORT BrowserAccessibility {
   // True if this is a web area, and its grandparent is a presentational iframe.
   bool IsWebAreaForPresentationalIframe() const;
 
+  // Is any control, like a button, text field, etc.
+  bool IsControl() const;
+
  protected:
   BrowserAccessibility();