Support tracking focused element for OOPIFs.

content/browser/renderer_host/render_view_host_delegate.h

Index: content/browser/renderer_host/render_view_host_delegate.h
diff --git a/content/browser/renderer_host/render_view_host_delegate.h b/content/browser/renderer_host/render_view_host_delegate.h
index b1709c349f5ed7739e66a4d3828b9ecd7651a125..2cdc4c3e5f07566714bd09f52c52c77d76bc3c34 100644
--- a/content/browser/renderer_host/render_view_host_delegate.h
+++ b/content/browser/renderer_host/render_view_host_delegate.h
@@ -231,6 +231,14 @@ class CONTENT_EXPORT RenderViewHostDelegate {
   // Whether download UI should be hidden.
   virtual bool HideDownloadUI() const;
 
+  // Whether the focused element on the page is editable. This returns true iff
+  // the focused frame has a focused editable element.
+  virtual bool IsFocusedElementEditable();
+
+  // Asks the delegate to clear the focused element. This will lead to an IPC to
+  // the focused RenderWidget.
+  virtual void ClearFocusedElement() {}
+
  protected:
   virtual ~RenderViewHostDelegate() {}
 };