Cross-process iframe accessibility.

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 17f70caf675fe7aa1a983d4e057d90e7d1f26f6e..1e8d8bd8dcf5a108a894042b68480ae463e2159f 100644
--- a/content/browser/accessibility/browser_accessibility.h
+++ b/content/browser/accessibility/browser_accessibility.h
@@ -245,6 +245,12 @@ class CONTENT_EXPORT BrowserAccessibility {
   // Append the text from this node and its children.
   std::string GetTextRecursive() const;
 
+  // Identifies the given frame id as the only child of this node, so

[Charlie Reis, 2014/08/20 20:37:13]

I don't follow why this would track a single child.  What if there were
multiple?

[dmazzoni, 2014/08/20 20:57:17]

This object would correspond to an actual <iframe> element on a page. It'd have
one child, the child frame.

+  // any call to PlatformChildCount/PlatformGetChild will use
+  // FrameTreeAccessibility to retrieve the BrowserAccessibilityManager
+  // of the child frame and return its root node as this node's child.
+  void SetChildFrameId(int64 child_frame_id);

[Charlie Reis, 2014/08/20 20:37:13]

nit: FrameId is ambiguous, between a RenderFrame routing ID and a FrameTreeNode
ID.  Can you clarify which one you mean, here and below?

[dmazzoni, 2014/08/20 20:57:17]

Agreed, let me clarify.

[dmazzoni, 2014/08/25 06:49:36]

Done.

+
  protected:
   BrowserAccessibility();
 
@@ -262,7 +268,8 @@ class CONTENT_EXPORT BrowserAccessibility {
   std::string name_;
   std::string value_;
 
- private:
+  int64 child_frame_id_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibility);
 };