Support accessible inline text boxes.

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 a52075128a519077ae5ef2a2e1e7a81bc1261e58..d5b2a3ca226b09a39cc5c07b399efd1acd49bf0a 100644
--- a/content/browser/accessibility/browser_accessibility.h
+++ b/content/browser/accessibility/browser_accessibility.h
@@ -62,6 +62,14 @@ class CONTENT_EXPORT BrowserAccessibility {
   // cross-platform generic object.
   virtual bool IsNative() const;
 
+  // Returns true if this is a leaf node on this platform, meaning any
+  // children should not be exposed to this platform's native accessibility
+  // layer. Each platform subclass should implement this itself.
+  // The definition of a leaf may vary depending on the platform,
+  // but a leaf node should never have children that are focusable or
+  // that might send notifications.
+  virtual bool IsLeaf() const;
+
   // Initialize the tree structure of this object.
   void InitializeTreeStructure(
       BrowserAccessibilityManager* manager,