Support tracking focused node element for OOPIFs.

content/browser/renderer_host/render_widget_host_delegate.h

Index: content/browser/renderer_host/render_widget_host_delegate.h
diff --git a/content/browser/renderer_host/render_widget_host_delegate.h b/content/browser/renderer_host/render_widget_host_delegate.h
index 80fbea2d0d76ebc7005c1eee90b9854ac2b4c88a..b9c236987fba7171e4a1fc63a1366c5e509c865b 100644
--- a/content/browser/renderer_host/render_widget_host_delegate.h
+++ b/content/browser/renderer_host/render_widget_host_delegate.h
@@ -236,6 +236,11 @@ class CONTENT_EXPORT RenderWidgetHostDelegate {
   virtual void FocusOwningWebContents(
       RenderWidgetHostImpl* render_widget_host) {}
 
+  // Notifies the delegate that a focused editable element has been touched
+  // inside this RenderWidgetHost. If |editable| is true then the focused
+  // element accepts text input.
+  virtual void FocusedNodeTouched(bool editable) {}
+
  protected:
   virtual ~RenderWidgetHostDelegate() {}
 };