a11y: Exclude children of nested keyboard accessible controls from a11y tree.

ui/accessibility/platform/ax_platform_node_delegate.h

Index: ui/accessibility/platform/ax_platform_node_delegate.h
diff --git a/ui/accessibility/platform/ax_platform_node_delegate.h b/ui/accessibility/platform/ax_platform_node_delegate.h
index 1e27f3f00a09f5d3754b07db46ada6405b934882..96663fbe4f2e24b014b127ef1c659bcb2f20e7ae 100644
--- a/ui/accessibility/platform/ax_platform_node_delegate.h
+++ b/ui/accessibility/platform/ax_platform_node_delegate.h
@@ -42,10 +42,10 @@ class AX_EXPORT AXPlatformNodeDelegate {
   // be a native accessible object implemented by another class.
   virtual gfx::NativeViewAccessible GetParent() = 0;
 
-  // Get the number of children of this node.
+  // Get the number of children of this node, excluding ignored children.
   virtual int GetChildCount() = 0;
 
-  // Get the child of a node given a 0-based index.
+  // Get the child of a node given a 0-based index, excluding ignored children.
   virtual gfx::NativeViewAccessible ChildAtIndex(int index) = 0;
 
   // Get the offset to convert local coordinates to screen global coordinates.
@@ -68,6 +68,9 @@ class AX_EXPORT AXPlatformNodeDelegate {
   // has focus.
   virtual gfx::NativeViewAccessible GetFocus() = 0;
 
+  // Whether this element should be ignored by the accessibility client.
+  virtual bool IsIgnored() = 0;
+
   //
   // Events.
   //