Support accessible inline text boxes.

content/browser/accessibility/browser_accessibility.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_
 
 #include <map>
 #include <utility>
 #include <vector>
@@ skipping 71 matching lines @@
 
   // Return true if this object is equal to or a descendant of |ancestor|.
   bool IsDescendantOf(BrowserAccessibility* ancestor);
 
   // Returns the parent of this object, or NULL if it's the root.
   BrowserAccessibility* parent() const { return parent_; }
 
   // Returns the number of children of this object.
   uint32 child_count() const { return children_.size(); }
 
-  // Return a pointer to the child with the given index.
-  BrowserAccessibility* GetChild(uint32 child_index) 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 PlatformIsLeaf() const;
+
+  // Returns the number of children of this object, or 0 if PlatformIsLeaf()
+  // returns true.
+  uint32 PlatformChildCount() const;
+
+  // Return a pointer to the child at the given index, or NULL for an
+  // invalid index. Returns NULL is PlatformIsLeaf() returns true.

[David Tseng, 2013/10/31 19:44:48]

s/is/if

+  BrowserAccessibility* PlatformGetChild(uint32 child_index) const;
 
   // Return the previous sibling of this object, or NULL if it's the first
   // child of its parent.
   BrowserAccessibility* GetPreviousSibling();
 
   // Return the next sibling of this object, or NULL if it's the last child
   // of its parent.
   BrowserAccessibility* GetNextSibling();
 
   // Returns the bounds of this object in coordinates relative to the
@@ skipping 187 matching lines @@
   // immediately return failure.
   bool instance_active_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibility);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_