Fix toolbar keyboard accessibility on Views (alternative impl).

ui/views/accessible_pane_view.h

Index: ui/views/accessible_pane_view.h
diff --git a/ui/views/accessible_pane_view.h b/ui/views/accessible_pane_view.h
index 0d563d7c726d60523f6894e02420dba0648556db..181608ef208ebabf5a4657ac40335ae19fc6665c 100644
--- a/ui/views/accessible_pane_view.h
+++ b/ui/views/accessible_pane_view.h
@@ -62,6 +62,15 @@ class VIEWS_EXPORT AccessiblePaneView : public View,
   // other than the first focusable child.
   virtual View* GetDefaultFocusableChild();
 
+  // Returns the parent of |v|. Subclasses can override this if
+  // they need custom focus search behavior.
+  virtual View* GetParentForFocusSearch(View* v);
+
+  // Returns true if |v| is contained within the hierarchy rooted at |root|
+  // for the purpose of focus searching. Subclasses can override this if
+  // they need custom focus search behavior.
+  virtual bool ContainsForFocusSearch(View* root, const View* v);
+
   // Remove pane focus.
   virtual void RemovePaneFocus();
 
@@ -90,6 +99,8 @@ class VIEWS_EXPORT AccessiblePaneView : public View,
   ui::Accelerator left_key_;
   ui::Accelerator right_key_;
 
+  friend class AccessiblePaneViewFocusSearch;
+
   DISALLOW_COPY_AND_ASSIGN(AccessiblePaneView);
 };