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 98460d7a89e9..67dba849df43 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.cc
+++ b/content/browser/renderer_host/render_widget_host_view_base.cc
@@ -406,6 +406,36 @@ cc::FrameSinkId RenderWidgetHostViewBase::FrameSinkIdAtPoint(
   return viz::FrameSinkId();
 }
 
+void RenderWidgetHostViewBase::ProcessKeyboardEvent(
+    const NativeWebKeyboardEvent& event,
+    const ui::LatencyInfo& latency) {
+  if (!GetRenderWidgetHost()) return;
+  GetRenderWidgetHost()->ForwardKeyboardEvent(event);
+}
+
+void RenderWidgetHostViewBase::ProcessMouseEvent(
+    const blink::WebMouseEvent& event,
+    const ui::LatencyInfo& latency) {
+  if (!GetRenderWidgetHost()) return;
+  GetRenderWidgetHost()->ForwardMouseEvent(event);
+}
+
+void RenderWidgetHostViewBase::ProcessMouseWheelEvent(
+    const blink::WebMouseWheelEvent& event,
+    const ui::LatencyInfo& latency) {
+  if (!GetRenderWidgetHost()) return;
+  GetRenderWidgetHost()->ForwardWheelEvent(event);
+}
+
+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);
+}
+
 gfx::Point RenderWidgetHostViewBase::TransformPointToRootCoordSpace(
     const gfx::Point& point) {
   return point;
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 657ad20..47920a9 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.h
+++ b/content/browser/renderer_host/render_widget_host_view_base.h
@@ -22,8 +22,10 @@
 #include "cc/output/compositor_frame.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/common/input/input_event_ack_state.h"
+#include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/common/screen_info.h"
 #include "ipc/ipc_listener.h"
@@ -76,8 +78,10 @@ class BrowserAccessibilityDelegate;
 class CursorManager;
 class RenderWidgetHostImpl;
 class RenderWidgetHostViewBaseObserver;
+class RenderWidgetHostViewGuest;
 class SyntheticGestureTarget;
 class TextInputManager;
+class WebContentsView;
 class TouchSelectionControllerClientManager;
 class WebContentsAccessibility;
 class WebCursor;
@@ -120,6 +124,9 @@ class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
   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.
   gfx::Point TransformPointToRootCoordSpace(const gfx::Point& point) override;
@@ -265,16 +272,21 @@ class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
       const gfx::Point& point,
       gfx::Point* transformed_point);
   virtual void ProcessKeyboardEvent(const NativeWebKeyboardEvent& event,
-                                    const ui::LatencyInfo& latency) {}
+                                    const ui::LatencyInfo& latency);
   virtual void ProcessMouseEvent(const blink::WebMouseEvent& event,
-                                 const ui::LatencyInfo& latency) {}
+                                 const ui::LatencyInfo& latency);
   virtual void ProcessMouseWheelEvent(const blink::WebMouseWheelEvent& event,
-                                      const ui::LatencyInfo& latency) {}
+                                      const ui::LatencyInfo& latency);
   virtual void ProcessTouchEvent(const blink::WebTouchEvent& event,
                                  const ui::LatencyInfo& latency) {}
   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