diff --git content/browser/web_contents/web_contents_impl.cc content/browser/web_contents/web_contents_impl.cc
index 4dca843104ac..63020b374688 100644
--- content/browser/web_contents/web_contents_impl.cc
+++ content/browser/web_contents/web_contents_impl.cc
@@ -2561,15 +2561,22 @@ void WebContentsImpl::Init(const WebContents::CreateParams& params) {
   std::string unique_name;
   frame_tree_.root()->SetFrameName(params.main_frame_name, unique_name);
 
-  WebContentsViewDelegate* delegate =
-      GetContentClient()->browser()->GetWebContentsViewDelegate(this);
+  if (params.view && params.delegate_view) {
+    view_.reset(params.view);
+    render_view_host_delegate_view_ = params.delegate_view;
+  }
 
-  if (browser_plugin_guest_) {
-    view_.reset(new WebContentsViewChildFrame(
-        this, delegate, &render_view_host_delegate_view_));
-  } else {
-    view_.reset(CreateWebContentsView(this, delegate,
-                                      &render_view_host_delegate_view_));
+  if (!view_) {
+    WebContentsViewDelegate* delegate =
+        GetContentClient()->browser()->GetWebContentsViewDelegate(this);
+
+    if (browser_plugin_guest_) {
+      view_.reset(new WebContentsViewChildFrame(
+          this, delegate, &render_view_host_delegate_view_));
+    } else {
+      view_.reset(CreateWebContentsView(this, delegate,
+                                        &render_view_host_delegate_view_));
+    }
   }
   CHECK(render_view_host_delegate_view_);
   CHECK(view_.get());
@@ -3368,6 +3375,15 @@ 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();
@@ -6850,6 +6866,10 @@ void WebContentsImpl::SetFocusedFrame(FrameTreeNode* node,
     // This is an outermost WebContents.
     SetAsFocusedWebContentsIfNecessary();
   }
+
+  observers_.ForEachObserver([&](WebContentsObserver* observer) {
+    observer->OnFrameFocused(node->current_frame_host());
+  });
 }
 
 void WebContentsImpl::DidCallFocus() {
diff --git content/public/browser/web_contents.cc content/public/browser/web_contents.cc
index f1dcf53ea481..192f7c0ddd04 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 f1c25ed4cf62..8bb6e9a374c7 100644
--- content/public/browser/web_contents.h
+++ content/public/browser/web_contents.h
@@ -82,8 +82,10 @@ class BrowserContext;
 class BrowserPluginGuestDelegate;
 class RenderFrameHost;
 class RenderViewHost;
+class RenderViewHostDelegateView;
 class RenderWidgetHostView;
 class WebContentsDelegate;
+class WebContentsView;
 class WebUI;
 struct CustomContextMenuContext;
 struct DropData;
@@ -212,6 +214,10 @@ 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 a10c5caf5a4b..ef8d3c3c1056 100644
--- content/public/browser/web_contents_delegate.h
+++ content/public/browser/web_contents_delegate.h
@@ -62,10 +62,12 @@ 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;
@@ -338,6 +340,14 @@ class CONTENT_EXPORT WebContentsDelegate {
       const std::string& 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 3666e0357038..b82c54816894 100644
--- content/public/browser/web_contents_observer.h
+++ content/public/browser/web_contents_observer.h
@@ -610,6 +610,10 @@ 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