diff --git content/browser/web_contents/web_contents_impl.cc content/browser/web_contents/web_contents_impl.cc
index 6f2ee557fb41..7a9bf5c4c642 100644
--- content/browser/web_contents/web_contents_impl.cc
+++ content/browser/web_contents/web_contents_impl.cc
@@ -2045,16 +2045,24 @@ 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 (GuestMode::IsCrossProcessFrameGuest(this)) {
-    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 (GuestMode::IsCrossProcessFrameGuest(this)) {
+      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());
 
@@ -2849,6 +2857,15 @@ 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);
+  }
+
   // If |is_new_browsing_instance| is true, defer routing_id allocation
   // to the WebContentsImpl::Create() call. This is required because with
   // a new browsing instance, WebContentsImpl::Create() may elect a different
@@ -6279,6 +6296,9 @@ void WebContentsImpl::SetFocusedFrame(FrameTreeNode* node,
     // doesn't support properly traversing BrowserPlugins.
     SetAsFocusedWebContentsIfNecessary();
   }
+
+  for (auto& observer : observers_)
+    observer.OnFrameFocused(node->current_frame_host());
 }
 
 void WebContentsImpl::DidCallFocus() {
diff --git content/public/browser/web_contents.cc content/public/browser/web_contents.cc
index 2e133afb8da8..e9a88a6bb96b 100644
--- content/public/browser/web_contents.cc
+++ content/public/browser/web_contents.cc
@@ -31,6 +31,8 @@ WebContents::CreateParams::CreateParams(BrowserContext* context,
       renderer_initiated_creation(false),
       desired_renderer_state(kOkayToHaveRendererProcess),
       starting_sandbox_flags(blink::WebSandboxFlags::kNone),
+      view(nullptr),
+      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 ecee31b744ed..72d79c0a7180 100644
--- content/public/browser/web_contents.h
+++ content/public/browser/web_contents.h
@@ -79,9 +79,11 @@ class BrowserPluginGuestDelegate;
 class InterstitialPage;
 class RenderFrameHost;
 class RenderViewHost;
+class RenderViewHostDelegateView;
 class RenderWidgetHost;
 class RenderWidgetHostView;
 class WebContentsDelegate;
+class WebContentsView;
 struct CustomContextMenuContext;
 struct DropData;
 struct MHTMLGenerationParams;
@@ -217,6 +219,10 @@ class WebContents : public PageNavigator,
     // Sandboxing flags set on the new WebContents.
     blink::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 2a073551cd8a..b049ef115f0d 100644
--- content/public/browser/web_contents_delegate.h
+++ content/public/browser/web_contents_delegate.h
@@ -57,10 +57,12 @@ class ColorChooser;
 class FileSelectListener;
 class JavaScriptDialogManager;
 class RenderFrameHost;
+class RenderViewHostDelegateView;
 class RenderWidgetHost;
 class SessionStorageNamespace;
 class SiteInstance;
 class WebContentsImpl;
+class WebContentsView;
 struct ContextMenuParams;
 struct DropData;
 struct NativeWebKeyboardEvent;
@@ -321,6 +323,14 @@ 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 b3c757d5d537..e2600917093e 100644
--- content/public/browser/web_contents_observer.h
+++ content/public/browser/web_contents_observer.h
@@ -571,6 +571,10 @@ 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