Pass accessible location change messages to the automation API.

content/browser/frame_host/render_frame_host_delegate.h

Index: content/browser/frame_host/render_frame_host_delegate.h
diff --git a/content/browser/frame_host/render_frame_host_delegate.h b/content/browser/frame_host/render_frame_host_delegate.h
index 0d0d9dd4988fd7b260b1a12c5d193a0693969177..9c77b5fa3e74625d9cb20bdfa3f8e2ebcda60892 100644
--- a/content/browser/frame_host/render_frame_host_delegate.h
+++ b/content/browser/frame_host/render_frame_host_delegate.h
@@ -41,6 +41,7 @@ class RenderFrameHost;
 class WakeLockServiceContext;
 class WebContents;
 struct AXEventNotificationDetails;
+struct AXLocationChangeNotificationDetails;
 struct ContextMenuParams;
 struct FileChooserParams;
 struct TransitionLayerData;
@@ -142,9 +143,12 @@ class CONTENT_EXPORT RenderFrameHostDelegate {
   // Get the accessibility mode for the WebContents that owns this frame.
   virtual AccessibilityMode GetAccessibilityMode() const;
 
-  // Invoked when an accessibility event is received from the renderer.
+  // Forward accessibility messages to other potential listeners like
+  // the automation extension API.
   virtual void AccessibilityEventReceived(
       const std::vector<AXEventNotificationDetails>& details) {}
+  virtual void AccessibilityLocationChangesReceived(
+      const std::vector<AXLocationChangeNotificationDetails>& details) {}
 
   // Find a guest RenderFrameHost by its parent |render_frame_host| and
   // |browser_plugin_instance_id|.