diff --git a/content/browser/renderer_host/render_widget_host_view_base.cc b/content/browser/renderer_host/render_widget_host_view_base.cc
index 09a37c1a2c70..ff8c2db3fdae 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.cc
+++ b/content/browser/renderer_host/render_widget_host_view_base.cc
@@ -399,6 +399,15 @@ viz::FrameSinkId RenderWidgetHostViewBase::FrameSinkIdAtPoint(
   return frame_sink_id.is_valid() ? frame_sink_id : GetFrameSinkId();
 }
 
+RenderWidgetHostViewBase* RenderWidgetHostViewBase::CreateViewForWidget(
+    RenderWidgetHost* render_widget_host,
+    RenderWidgetHost* embedder_render_widget_host,
+    WebContentsView* web_contents_view) {
+  return web_contents_view->CreateViewForWidget(
+    render_widget_host,
+    !!embedder_render_widget_host);
+}
+
 void RenderWidgetHostViewBase::ProcessMouseEvent(
     const blink::WebMouseEvent& event,
     const ui::LatencyInfo& latency) {
diff --git a/content/browser/renderer_host/render_widget_host_view_base.h b/content/browser/renderer_host/render_widget_host_view_base.h
index 8e391207a8a7..d3637c82aba9 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.h
+++ b/content/browser/renderer_host/render_widget_host_view_base.h
@@ -21,8 +21,10 @@
 #include "components/viz/common/surfaces/scoped_surface_id_allocator.h"
 #include "components/viz/common/surfaces/surface_id.h"
 #include "content/browser/renderer_host/event_with_latency_info.h"
+#include "content/browser/web_contents/web_contents_view.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/render_frame_metadata_provider.h"
+#include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/common/input_event_ack_state.h"
 #include "content/public/common/screen_info.h"
@@ -79,10 +81,12 @@ class BrowserAccessibilityManager;
 class CursorManager;
 class RenderWidgetHostImpl;
 class RenderWidgetHostViewBaseObserver;
+class RenderWidgetHostViewGuest;
 class SyntheticGestureTarget;
 class TextInputManager;
 class TouchSelectionControllerClientManager;
 class WebContentsAccessibility;
+class WebContentsView;
 class WebCursor;
 struct TextInputState;
 
@@ -124,6 +128,9 @@ class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
   float GetDeviceScaleFactor() const final;
   TouchSelectionControllerClientManager*
   GetTouchSelectionControllerClientManager() override;
+
+  virtual void InitAsGuest(RenderWidgetHostView* parent_host_view,
+                           RenderWidgetHostViewGuest* guest_view) {}
 
   // This only needs to be overridden by RenderWidgetHostViewBase subclasses
   // that handle content embedded within other RenderWidgetHostViews.
@@ -318,6 +325,11 @@ class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
   virtual void ProcessGestureEvent(const blink::WebGestureEvent& event,
                                    const ui::LatencyInfo& latency);
 
+  virtual RenderWidgetHostViewBase* CreateViewForWidget(
+      RenderWidgetHost* render_widget_host,
+      RenderWidgetHost* embedder_render_widget_host,
+      WebContentsView* web_contents_view);
+
   // Transform a point that is in the coordinate space of a Surface that is
   // embedded within the RenderWidgetHostViewBase's Surface to the
   // coordinate space of an embedding, or embedded, Surface. Typically this