diff --git content/browser/web_contents/web_contents_impl.cc content/browser/web_contents/web_contents_impl.cc
index b7e32f44573be..11e64de06065b 100644
--- content/browser/web_contents/web_contents_impl.cc
+++ content/browser/web_contents/web_contents_impl.cc
@@ -2739,6 +2739,12 @@ void WebContentsImpl::Init(const WebContents::CreateParams& params) {
   frame_tree_.Init(site_instance.get(), params.renderer_initiated_creation,
                    params.main_frame_name, type);
 
+  if (params.view && params.delegate_view) {
+    view_.reset(params.view);
+    render_view_host_delegate_view_ = params.delegate_view;
+  }
+
+  if (!view_) {
   WebContentsViewDelegate* delegate =
       GetContentClient()->browser()->GetWebContentsViewDelegate(this);
 
@@ -2749,6 +2755,7 @@ void WebContentsImpl::Init(const WebContents::CreateParams& params) {
     view_.reset(CreateWebContentsView(this, delegate,
                                       &render_view_host_delegate_view_));
   }
+  }
   CHECK(render_view_host_delegate_view_);
   CHECK(view_.get());
 
@@ -3598,6 +3605,15 @@ RenderFrameHostDelegate* WebContentsImpl::CreateNewWindow(
   // objects.
   create_params.renderer_initiated_creation = !is_new_browsing_instance;
 
+  if (delegate_) {
+    delegate_->GetCustomWebContentsView(this,
+                                        params.target_url,
+                                        render_process_id,
+                                        opener->GetRoutingID(),
+                                        &create_params.view,
+                                        &create_params.delegate_view);
+  }
+
   std::unique_ptr<WebContentsImpl> new_contents;
   if (!is_guest) {
     create_params.context = view_->GetNativeView();
@@ -7270,6 +7286,9 @@ void WebContentsImpl::SetFocusedFrame(FrameTreeNode* node,
     // This is an outermost WebContents.
     SetAsFocusedWebContentsIfNecessary();
   }
+
+  observers_.NotifyObservers(&WebContentsObserver::OnFrameFocused,
+                             node->current_frame_host());
 }
 
 void WebContentsImpl::DidCallFocus() {
diff --git content/public/browser/web_contents.cc content/public/browser/web_contents.cc
index f1dcf53ea481b..192f7c0ddd04f 100644
--- content/public/browser/web_contents.cc
+++ content/public/browser/web_contents.cc
@@ -29,6 +29,7 @@ WebContents::CreateParams::CreateParams(BrowserContext* context,
       renderer_initiated_creation(false),
       desired_renderer_state(kOkayToHaveRendererProcess),
       starting_sandbox_flags(network::mojom::WebSandboxFlags::kNone),
+      delegate_view(nullptr),
       is_never_visible(false) {}
 
 WebContents::CreateParams::CreateParams(const CreateParams& other) = default;
diff --git content/public/browser/web_contents.h content/public/browser/web_contents.h
index fe5bc4ade5cdb..266a37c66001d 100644
--- content/public/browser/web_contents.h
+++ content/public/browser/web_contents.h
@@ -88,8 +88,10 @@ class BrowserContext;
 class BrowserPluginGuestDelegate;
 class RenderFrameHost;
 class RenderViewHost;
+class RenderViewHostDelegateView;
 class RenderWidgetHostView;
 class WebContentsDelegate;
+class WebContentsView;
 class WebUI;
 struct DropData;
 struct MHTMLGenerationParams;
@@ -229,6 +231,10 @@ class WebContents : public PageNavigator,
     // Sandboxing flags set on the new WebContents.
     network::mojom::WebSandboxFlags starting_sandbox_flags;
 
+    // Optionally specify the view and delegate view.
+    content::WebContentsView* view;
+    content::RenderViewHostDelegateView* delegate_view;
+
     // Value used to set the last time the WebContents was made active, this is
     // the value that'll be returned by GetLastActiveTime(). If this is left
     // default initialized then the value is not passed on to the WebContents
diff --git content/public/browser/web_contents_delegate.h content/public/browser/web_contents_delegate.h
index 96c3b9e9b7e10..087a717df3680 100644
--- content/public/browser/web_contents_delegate.h
+++ content/public/browser/web_contents_delegate.h
@@ -59,10 +59,12 @@ class EyeDropperListener;
 class FileSelectListener;
 class JavaScriptDialogManager;
 class RenderFrameHost;
+class RenderViewHostDelegateView;
 class RenderWidgetHost;
 class SessionStorageNamespace;
 class SiteInstance;
 class WebContentsImpl;
+class WebContentsView;
 struct ContextMenuParams;
 struct DropData;
 struct MediaPlayerWatchTime;
@@ -340,6 +342,14 @@ class CONTENT_EXPORT WebContentsDelegate {
       const StoragePartitionId& partition_id,
       SessionStorageNamespace* session_storage_namespace);
 
+  virtual void GetCustomWebContentsView(
+      WebContents* web_contents,
+      const GURL& target_url,
+      int opener_render_process_id,
+      int opener_render_frame_id,
+      content::WebContentsView** view,
+      content::RenderViewHostDelegateView** delegate_view) {}
+
   // Notifies the delegate about the creation of a new WebContents. This
   // typically happens when popups are created.
   virtual void WebContentsCreated(WebContents* source_contents,
diff --git content/public/browser/web_contents_observer.h content/public/browser/web_contents_observer.h
index 7ee27742d3c05..0998a74a5ec0f 100644
--- content/public/browser/web_contents_observer.h
+++ content/public/browser/web_contents_observer.h
@@ -648,6 +648,10 @@ class CONTENT_EXPORT WebContentsObserver : public IPC::Listener {
   // WebContents has gained/lost focus.
   virtual void OnFocusChangedInPage(FocusedNodeDetails* details) {}
 
+  // Notification that |render_frame_host| for this WebContents has gained
+  // focus.
+  virtual void OnFrameFocused(RenderFrameHost* render_frame_host) {}
+
   // Notifies that the manifest URL for the main frame changed to
   // |manifest_url|. This will be invoked when a document with a manifest loads
   // or when the manifest URL changes (possibly to nothing). It is not invoked